Rather long video by Scott Manley, who normally blogs about things space related. This is a "rant," in which he streams his thoughts and responds to questions and comments from viewers. One interesting thing he did say that I made note of, concerning the energy released when the Titan submarine imploded. If we assume that it made it to a depth of 8000 feet, we can estimate the amount of energy that was focused on its occupants by just turning the situation around (in a sense) and calculating the amount of energy needed to clear one cubic meter of volume...