Update obstacles.json

config/obstacles.json

@@ -538,7 +538,7 @@
 	},
 	"55":
 	{
-		"allowedTerrains" : ["water"],
+		"specialBattlefields" : ["ship"],
 		"width" : 3,
 		"height" : 3,
 		"blockedTiles" :  [-15, -16, -33],