Noooo

[Isphius]

It could be a BHG, cause getting water in your cylinders would make the radiator be lower and stop your motor from turning over. And normally the catch can will go down but not be empty, Its there to make up from expansion and contraction(heating and cooling). But i wouldnt quite say full to empty...lol. Id say do not try to drive your car, Pull the spark plugs out and try to turn it over. If it does, look for water. Or stick a paper towell in each hole and look for water. Or if it doesnt turn over, Its a power/starter broken issue. But as a general rule, Just because you rule out a problem by way of isolation, Doesnt mean it isnt there. meaning still maybe water in there if it doesnt turn over, Its just not the only thing. just to be safe keep looking once you get it to start. Did you check battery too?