The submarine in the sky is a vehicle in New and Improved Medici and fiction by GMRE.

Description[]
It's a big crashed submarine of an unknown origin. The submarine seems to have been designed during the 1980s and it's of the ICBM-launcher type.
The wreck is about 160 meters long, but the front end is damaged, so it obviously used to be a little longer.
How it got there[]

It's believed to have crashed into the rain cloud (schematic on the right) when the cloud was refueling in the sea.
Location[]
There's an area of clouds where the clouds become much denser than normal clouds and some clouds can even be walked on.
Trivia[]
- This is an easter egg referencing the myth that apparently "there are more planes in the sea than submarines in the sky". That myth is obviously not true in Medici, since at the time of writing this article, there were no plane wrecks in the sea in the known Just Cause Universe.