Definitely give it a go ! If they were cheaper, smaller, and more accessible, I'd tell you to get an underwater drone, then 'sic it on various creatures that it would then follow and film for a few minutes at a time. If you lived by the sea and wanted a hobby of filming them, this beauty would be perfect.
PS: You forgot the proof-of-filming-snake-underwater photo ;) (Though it might have been sliiightly more complicated than your normal photos XD)
LOL on the proof! Yeah, distracted and such!