sgbeachbum.blogspot.com/
Could this strange creature be from outer space? Does planet earth really have such creatures?
Does Singapore have them as well?

Well, Singapore definitely has synaptic sea cucumbers! Lots of them can be found on wonderful Cyrene Reef off the West Coast. (More on Cyrene here : wildsingapore.com/places/cyrene.htm)

Found this rather large synaptic sea cucumber of Cyrene Reef. It was very much larger (about 4cm in diameter) than any other I'd seen before. You can really see how it uses it's grasping tentacles to grasp material and shove it into it's mouth. The tentacles look like they have some sort of sticky ability. Anything they come across gets pulled into the mouth and passed down the digestive tract. You can just about make out the wave-like motion along the body of the animal.

The body is unlike that of other sea cucumbers. The synaptics' use the surrounding water to stretch themselves out. When they need to, they can instantly expel the water by contracting the body wall. (see the clip ending when the synaptic contracts itself away from the camera).