We Have Already Seen...
...Hunt and Lyssa, having been accidentally-transported via Volta spacecraft from St Louis to Paris, must now find their way back to America, but without alien technology to help them...
Fiction House's Planet Comics #31 (1944) continues the trek across a devastated Europe...which, ironically mirrors the then-current situation known to us as World War II!
But even bigger changes are coming to the Lost World, as you'll see next week!
Note: While some spacecraft and submarines look similar, they're actually designed to operate in totally-different envrionments!
Spaceships fly though a near-vacuum, and low gravity so they're built to keep their interiors from exploding outward!
OTOH, subs are designed to keep incredibly-heavy water pressure from crushing them like tin cans.
Unless you can figure out how to make the vessel's structure do both effectively, a combo-use ship isn't really feasible...
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