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Little back story on this. Got my 6 year old into KSP, and he is of building his own contraptions to meet self directed goals. First was a rover to collect science around KSP (Success), next was a rocket plane that could go to orbit and back (needed help on piloting and re-entry, but also eventually successful) His next goal: a submarine to eve to swim around and get science from the bottom at different locations. I got to credit him for being ambitious, and I will step him through some intermediate goals first, but his ultimate goal is a bit beyond what I've so far accomplished. So some questions for the experts: 1) What's the density of explodium? Are we talking liquid mercury, or something closer to the 1 kg/L water sits at. 2) How does negative elevations impact Rocket ISP. Obviously Aerospikes are probably the only viable option for movement (I've not yet been successful with stock electric propellers), but will pressure continue to increase as depth increases to the point where Aerospikes stop working? 3) I have a rough plan on ballast management (beaching after re-entry and filling ore tanks ashore before exploring the depths), but interested in anyone smarter than me has a good idea on this. 4) My 6 year old takes Jeb everywhere, So I'm gonna have to figure someway to get him back. Probably not in anything attached to the sub, so I'll need something that can precision land near the coast, then get back to orbit from sea level. Given there is nothing precision with my current design for Eve accent vehicle (Moar boosters and brute force and all that), tips on this are welcome.