I bet billionaires back off the space race
Outside of re entry I bet space is a lot safer then 2 miles deep under the ocean... I really have no clue though

If you have a hull breach in space, supposedly you have up to a few minutes to fix it or put a suit on. 4000m below the surface, you have none.

Either one you could get trapped and suffocate, though, so I think I'm happy on land.