(svn r15748) -Fix (r1722): the assumption that the number of tiles on the X side equals the number of tiles on the Y side does not hold anymore. As a result of this submarines could be created far outside of the map. Later in r15733 we would test whether that tile would be a water tile and we'd find out the tile isn't within the map.

src/disaster_cmd.cpp

@@ -885,7 +885,7 @@ static void Disaster_Submarine_Init(DisasterSubType subtype)
 	int x = TileX(r) * TILE_SIZE + TILE_SIZE / 2;
 
 	if (HasBit(r, 31)) {
-		y = MapMaxX() * TILE_SIZE - TILE_SIZE / 2 - 1;
+		y = MapMaxY() * TILE_SIZE - TILE_SIZE / 2 - 1;
 		dir = DIR_NW;
 	} else {
 		y = TILE_SIZE / 2;