Sea level sunset.

http://ift.tt/1WtgdrK

Free diving in a mine without oxygen

https://www.youtube.com/attribution_link?a=dm27KnEXFJw&u=%2Fwatch%3Fv%3Dv5oUxJX1Uqo%26feature%3Dshare

Found: One ship's propeller uncovered in a deep watery grave. Owner unknown.

http://ift.tt/1Q5gfGz

All of a sudden, in the depths...

http://ift.tt/1ixfpVy

Drone crashes into the ocean, slowly sinks before capturing footage of underwater life at the seafloor.

https://www.youtube.com/watch?v=O5ZkpXG0-eU

Lake overflow drain - not sure if these are posted a lot, but these skeeve me out...

http://ift.tt/1Q0F33z

World's rarest whale is scary (x-post /r/interestingasfuck)

http://ift.tt/1M4rR7N