mmm its probably not what you're looking for but I had some luck carving out an underwater path that land units can cross using the "desert pit" CSG
if saving problems with the system editor are being looked into, this one seems to be happening fairly regularly as well
sorry if im being a big dum dum but you're trying to make a bridge thats in or under the water that land units can cross? From what i've messed...
Thank you for taking the time to make and upload this map - it's great! Is it possible at some point to perhaps see a smaller, maybe even half size...
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