Found out a way how to break out of the map, we did it by misstake when we tried to build golems at watergate just by the water at garrisson in a border map, me and two other accidentally broke out in this way.
I think that there is a bug when you sometimes get stuck in the floor when you’re building siege, and because we were at a corner, the game pushed us out of the map and down into the water under the map.