Can you guess what this is?

Photo: Collected
The National Geographic channel has posted a new video on November 24, 2017 of a snake like creature reading a caption ‘Can you guess what this is?’
After posting the video people have started thinking and answering but all the answers were wrong.
The video shows this snake like creature is pulling out its body from the ground under the sea water.
Meanwhile, people will get the correct answer when the National Geographic authorities disclose its identity.