Jail

From Mr. Green Wiki

Jail

If a player falls from a ramp on a surf map, they will most likely end up in jail. This is a defined space on the map that is often contained with an exit that has to be opened from the outside by a teammate. Whilst in jail the player is a sitting duck, although camping the teleport exit to jail is not uncommon.

Escaping

Often a map will have a secret method whereby the player can escape, learning this could be vital.