Was watching a video on someone flying a brand new jet up as high as it could go. Full afterburners, straight up.

Mentions altimeter is spinning like in "Looney Toons".

Engine caps at 60km due to lack of oxygen.

Says you can see the curvature of the earth. Blue on black.

Google how high space is.

Holy f***

100km.

Dude just broke about halfway.

We're gonna need a lot of water rockets.

Back to op though, I kind of like the idea of pressurizing things deep see if we can build an efficient track down/back. (Not necessarily for space ends)

They're looking at underwater pressure tanks as a form of energy storage. Put a bulb on the bottom of the sea. When you have excess energy, pump air into it. (at high pressure.) When you want energy back, run hydro on the water filling it back up.

Neat stuff.

Pressure tank article