When I went to the boat a month ago, there was a foot of ice in the bilge. Needless to say, it had me worried, but I couldn't get to it for personall and business reasons. In this last heat wave here in Michigan, the ice melted, so I ran down to the boat to pump it out and to my suprise, not only had it melted, it drained out. So now I don't have water in my bilge, but I do have leakage. Come spring I will dump a couple of buckets of water (loaded with red dye) and when it leaks out, I'll have an indication of where the bottom needs attention. Cheers.