Their whole channel is full of cool stuff like this and they have found a bunch of super cool sea creatures over the years.

Two of my recent favorites:

Inverted CO2 bubble rain (very pretty) https://www.youtube.com/watch?v=ukw18XOQlR4 (would be even better without youtube compression...)

Smol boi go big during close up shot https://www.youtube.com/watch?v=Yc0UJaJN8EE