Tanjung Rimau Security Barriers - Some changes and slight improvements

The sky presented itself with a beautiful sunset as I did an update on the security barriers at Tanjung Rimau, Sentosa.

Sunset from Sentosa

How have the security barriers progressed after my last visit in August 2013? Were there improvements done or has situation worsened?
There were only one obvious change made to the line of security barriers at Tg Rimau. The drums chained on the high shore, some of which were broken, were removed.

Let us see the progression of the drums on the high shore since I started documenting this in April 2013.

[Image taken in April 2013]

Here's a picture I took in August, showing where the blue drums starts from the high shore.

Blue drums starts right next to where this photo was taken, furthest on the high shore.
[Image from August 2013]

Here's the picture I took on this trip landwards, showing that the blue drums starts on the rocky - sandy high shore.

Obvious different between the April photo and the photo taken on this trip.

With the drums removed from the high shore, no more sighs of broken drums and contents spilling onto the rocky surfaces.

Wider view of the high shore, where the connecting chains can be seen.

The chains are anchored at the same spot.

This is where the line of drums begins from the shore. The concrete cube is visible in the background.

Start of the line of drums.

I am not sure if the drums are serviced and changed regularly, but when the tides goes out, the organisms (mostly algae and some barnacles) growing on the lower parts of the drums are revealed.

Blue drums resting on the reefy shore when the tides goes out.

Other than the improvements done on the high shore, the rest of the line looks the same as what I saw during my last visit. The concrete cube which the line of drums is attached to is still sitting at the spot while the drums forms a corner.

Concrete cube and drum corner.

Here's an overview video of the security barrier line near the concrete cube is.


As it was an evening trip, I had to move and work fast checking out this barrier line as it is rather difficult to document them when the light goes dim in the sky.

As mentioned in my previous update about the security barriers, there was a tilted buoy along this line of barriers which might have caused the change in the outline of the barriers on this shore. The image taken in August showed the buoy tilted at about 45 degrees to the horizon.

Tilted buoy documented in August.

On this trip, the same buoy is resting on the reef and it looks different. The buoy is almost horizontal on the reef.

The buoy at the same location.

On the reef where the buoy is resting on, it looks pale as though the parts have been scraping the surface.

Buoy on the reef.

Pale surfaces caused by the buoy?

I am assuming that this is the same buoy as the one I saw in August. Some markings have "disappeared" and it is difficult to make comparison.

Markings on the lower part of the buoy - "PCG" and "01"
[Image taken in August]

Image taken on this trip - Barely visible "PCG", missing "01", addition "W-2" markings

The blinking light attached at the tip of the buoy had been removed. And so is the stick with the cross.

Top of buoy, blinking light and cross point present.
[Image taken in August]

Cross point and blinking light missing.

The whole buoy is slowly being encrusted with some parts probably rusting away. This is a view where the blinking light was attached with the solar panels.

Rusting top and encrusted solar panels.

View of the whole buoy.

It was rather "exciting" having a closer look at this buoy as the ferry services to and from Batam make use of the waterway in front of this shore. This means that each time the ferry passes by, large waves generated by the ferry will reach the shore at Tg Rimau. Even at low tide, these large waves are rather strong, especially when I was already standing in just below knee deep water at the buoy. I had to scramble for slightly higher ground on the reef on two occasions, right next the circular structure while I grabbed onto the structure of the buoy.

This video will show how strong the ferry generated waves can be as they head towards the shallow shore.


There was a drum near the buoy that looked rather dented.

Dented drum.

Armed with a GPS device, I marked some coordinates along the security barrier line and tried to map out more accurate points on Google Earth. The purple line shows the rough line of the security barriers with the help of 5 GPS coordinate points. The short red line is the chain from the concrete cube to the drum "corner". The GPS coordinate marking end at the buoy ("Beacon" on the image).

Purple line shows the line of security barriers.

The shore at Tg Rimau is still pretty much alive as the sunsets. I came across many clusters of Tape Seagrass (Enhalus acoroides).

Tape seagrass

The shore area after the start of the barrier was so densely covered with the Hairy green seaweed (Bryopsis sp.) that I have to carefully place my foot so that I do not step on loose pieces of rubble or animals hiding under the seaweeds.

Thick layer of hairy green seaweed on the shore.

Unfortunately, my compact flash card from my DSLR has some problems and I could not extract out the photos. So no critter updates on what I saw during this trip. Hope that I will be able to recover my photos in that card.


Read more about the security barriers at Sentosa (in chronological order):
Security Barriers at Tanjung Rimau, Sentosa [28 April 2013]
Updates on Security Barrier at Tanjung Rimau, Sentosa [10 August 2013]

Updates on Security Barrier at Tanjung Rimau, Sentosa

Today I visited Tg Rimau at Sentosa for a purpose in mind. I wanted to check out on the security barriers placed on this shore and have a visual update since my last visit in April 2013. It was a chilly and windy short walk to the shore, located right next to Shangri-La Rasa Sentosa Resort & Spa Singapore. Even the water was cold early in the morning.

I was rather astound by the sight when I reached the beach.

Tg Rimau with the security barrier visible on the shore.

The security barrier line looked very different from what I saw in April 2013, which I blogged about it in my post here.
Here is a comparison of the view taken today and in April 2013, from same location on the shore

Image taken in April 2013

Image taken today (August 2013)

Very clear from the two images, the outline formed by the security barrier has changed A LOT within 4 months. Ria also posted an image near this location in June 2013, from a spot nearby and you can see barrier line has already changed.

Image taken in June 2013
[Photo by Ria Tan]

The original security barriers line started of just parallel to the shoreline, ending off with a sea buoy as seen in this image taken by Ria in January 2013.

Image taken in January 2013
[Photo by Ria Tan]

When I first checked out the situation in April 2013, there was an additional line of floating barriers starting from sea buoy 1 running perpendicular to the shore and the end of this line was anchored to large rocks on the high shore. The line of security barriers formed a perpendicular connection from the shore and along the coastline. The image from Google Earth show an estimate outline in April, drawn red. The numbers "1" and "2" denotes the sea buoy along the barrier line while the strike refers to the concrete cube.

Rough outline of the barriers in red, April 2013.

Today, Buoy 1 at the ending corner was seen diagonally inwards towards the shore and perpendicular to the second sea buoy. Refer to the Google Earth image for a clearer idea of the changed barrier line.

New rough outline, August 2013.

Looking at the position of Buoy 1 and how it is sitting tilted on the coral rubble area made me want to find out more what exactly is going on to this barrier line.

Buoy 1 is tilted and looks seated on the rubble area.

Here is a video showing an overview of the floating barriers.

There was a challenge in getting near the barriers. The whole shore at Tg Rimau was heavily covered with Hairy green seaweeds (Bryopsis sp.). 

Abandoned frog sculpture surrounded by Bryopsis sewaweeds

It increased the difficulty level in walking on the coral rubble area as I could not see what I am stepping on. Furthermore, there have been encounters with Mr Stonefish on this shore by shore visitors. With vigilant eyes and careful walking, I made it to the barriers.

During the previous trip, I did not do a careful observation of the blue drums. Today, I noticed that are marked with the letters "PCG". A simple search reveals that "PCG" stands for Police Coast Guard.

"PCG" marked on the floating drums.

From an online newspaper article, these floating sea barriers were installed to 'deter illegal landing'. Even Buoy 1 is marked using spray paint. I assume that the number marking is number identification purpose.

Markings on buoy 1.

As I approach Buoy 1 from the floating barriers, I noticed the buoy has a extended base and it is visible in the shallow water as the tide goes out. I suppose this extension at the base helps to keep the buoy upright when the water level is deep enough for it to float.

Visible extension at the base.

A closer inspection of Buoy 1 shows that due to the receding tide and the extension at the base, the buoy is unable to settle at the rubble area in a upright position. Hence it has to tilt to settle and probably during the cause of it crushing many animals, corals or burrows as it lands on the substrate. This repeats about twice per day due to the tide cycle.

Closer look at the resting position of the buoy.

The buoy comes with solar panel LED blinking light and serial number.

Solar panel blinking light

Label for the LED light

Other than chains connecting the buoy to the floating barriers, there is also a long run of chains at the base of the buoy to somewhere.

More chains by the sides at the base, not connected to the floating barriers.
I guess the white mass in the center could be some coral.

The chains that connect from the buoy base and probably anchored to the ground somewhere further down.

As for the floating barriers, they are connected with chains of various lengths.

Long length

Mid length

Super short length

Chains of closely connected floating barriers.

Some floating barriers shows obvious signs of impact on the reef.

White patches on the reef where the floating barrier scrapes.

With Tg Rimau facing a heavy sea traffic of ferry and boat services, the large waves generated by sea transportation will magnify the impact of the floating barriers on the reef. This video shows how the floating barriers move with the large waves generated by a ferry service.

While this video shows how one of the floating barriers is impacting the reef.

A Pimply sally-light-foot crab (Plagusia squamosa) used a side of the floating barrier as a temporary resting place, sharing it with limpets and tiny marine snails.

Pimply sally-light-foot crab

Walking along the floating barrier line towards high shore, I came to the concrete cube where the additional floating barrier line was. Here's a comparison between April 2013 and August 2013 (today).

April 2013, floating drum laid on top of the concrete cube.

August 2013, floating drums are in front of the concrete cube but still attached to it though a chain.

The chain from the concrete cube to the floating barriers lay across a patch of Tape seagrass (Enhalus acoroides).

Chain falling on a patch of Tape seagrass.

And to the chain near the concrete cube, the heavy duty metal cable loops through and is already rusting.

Heavy duty metal cable loops though the chain.

Standing in front of the concrete cube, the floating barrier line looks like this. The red line helps to trace the barrier line with buoy 1 along the way.

Tracing of floating barrier from the concrete cube.

Turning anticlockwise from this spot, the floating barriers lead me to the high shore.

Floating barriers to high shore

Things on the high shore looks much worst than on the reef. The floating barriers are dry on the surface, badly scratched and broken, revealing the barrier's content.

Torn part of the barrier, showing the white content inside.

This barrier looks like it has undergone multiple scraping with the rocks until a flat surface at the scraping zone is formed.

Flat contact surface on the barrier.

The content of the barrier looked and felt like some industrial foam packed inside and it is slowly disintegrating, scattering the tiny foam pieces all over the rocks.

The whole barrier is packed with the white material.

It is some type of thick foam.

Tiny bits of disintegrated foam scattered on the algae covered rocks.

Closeup image of the foam bits

Larger piece of foam on the rock.

It is unsure if this material is biodegradable. Do the foam bits have the same categorisation or impact as Styrofoam bits when looking from the marine trash point of view? Are the tiny bits posing a threat similar to the microbeads in body wash?

While walking along the floating barrier, I spotted something among the coral rubble.

Something long, shiny and has groves.

It is a long bolt.

Long bolt

It is not just any ordinary bolt. The imprint on the bolt head matched those used on the floating barriers. This is very suspicious.

Imprint on the bolt head.

Bolt head used on the floating barrier. It matched the head of the found bolt on the rubble.

There are some questions running through my mind.

1. The found bolt in the coral rubble. Does it mean some form of maintenance of the floating barriers took place?
2. How did Buoy 1 shifted from the original position to the current location? Was it shifted purposely or the waves brought it in?
3. Are the relevant authorities aware of the broken barriers situation on the high shore?

At the moment, it is difficult for me to judge whether the floating barriers have deleterious effect on the reef at Tg Rimau. However, I am certain that the floating barriers have caused some damaging impact on some parts of the reef.  Furthermore, the disintegrating foam from the broken barrier on the high shore is also of great concern.


Here is a consolidation of the blog posts about the security barriers at Tg Rimau:
Floating barriers installed along Sentosa shore, 26 June 2012
Security Barriers at Tanjung Rimau, Sentosa, 28 April 2013
Sentosa battered by blue drums?, 12 June 2013