Chunnel patch 28397: Codechange: Chunnels can't pass oilrigs.

https://www.tt-forums.net/viewtopic.php?p=1183416#p1183416

src/industry_cmd.cpp

@@ -21,6 +21,7 @@
 #include "cheat_type.h"
 #include "genworld.h"
 #include "tree_map.h"
+#include "tunnel_map.h"
 #include "newgrf_cargo.h"
 #include "newgrf_debug.h"
 #include "newgrf_industrytiles.h"
@@ -1457,6 +1458,11 @@ static CommandCost CheckIfIndustryIsAllowed(TileIndex tile, int type, const Town
 		return_cmd_error(STR_ERROR_CAN_ONLY_BE_BUILT_NEAR_TOWN_CENTER);
 	}
 
+	if (type == IT_OIL_RIG &&
+			(IsTunnelInWay(tile, 0) ||
+			IsTunnelInWay(tile + TileDiffXY(0, 1), 0) ||
+			IsTunnelInWay(tile + TileDiffXY(1, 2), 0))) return_cmd_error(STR_ERROR_NO_DRILLING_ABOVE_CHUNNEL);
+
 	return CommandCost();
 }