no dmg deep in the water

Fixed, thanks. The warning comes from your game, but the damage comes from the server, and the server thought the water in Altgard was much lower than it is, so deep parts like Gribade Crater Lake counted as dry land. The server now uses the game's own water levels, lakes and rivers included, on every map, so staying deep under water hurts as the warning says. Places below the water line that have a roof, like Altgard's prison, stay safe. Live after the next server update.