There's also another unusual way - the Caisson lock.
Its design is TERRIFYING.
The boat is floated into a tube that get sealed at both ends and then (in the dark..) that tube is winched down into a completely flooded chamber until it (hopefully) lines up with the egress port at the bottom. The tube with the boat in is unsealed and the boat floats out.
"drywall/plasterboard", "skin of bricks"... I wish!
Here I am with 12" thick stone walls and wifi can barely make it from the next room.
I'm so glad the previous owner ran a little bit of ethernet cable!
Its design is TERRIFYING.
The boat is floated into a tube that get sealed at both ends and then (in the dark..) that tube is winched down into a completely flooded chamber until it (hopefully) lines up with the egress port at the bottom. The tube with the boat in is unsealed and the boat floats out.
https://en.wikipedia.org/wiki/Caisson_lock