In looking for a Space Saturdays video (which I found and will post Saturday), I found this video – Dive into the Deep Dark Ocean in a High-Tech Submersible!: https://www.youtube.com/watch?v=eDb7VRxW9Cw (around 14:22 minutes long).
Come join Greg Foot on a scientific adventure diving down into the deep dark ocean! Starting on the deck of the ‘Baseline Explorer’, you’ll be lifted out into the waves, you’ll be cleared to dive, then you’ll break the surface and head down, further and further, until you reach the side of an underwater volcano 250m under the surface, in the Twilight Zone just off the coast of Bermuda!
At that depth, I probably would be willing to get on it.
Past Space Saturdays: https://upsdownsfamilyhistory.wordpress.com/tag/space-saturdays/