Workers on an oil platform filmed the strange light emanating from the seabed

[BeyondKnowledge]

Could be a gass upwelling. That would make the surface look white.

Also could be the Sun shining through a hole in the cloud cover.

I was expecting something actually showing underwater lights but this only shows the surface at a long distance and not light from the bottom of the sea. The description of it being on the sea bed is not indicated in any way by this video.