Finally found a boat that we're serious enough about to put in an offer and get a survey, but on a second visit to the boat, discovered that the bilge had filled and 2"to 3" of water had covered the cabin sole. It was explained that something had been left on and killed the battery so the bilge pump wasn't working. We've never had a sailboat that was kept in the water, (moving up from trailer sailing) so my question is, what could have caused this to happen and is it a problem that could be dealt with. The boat is in the water and would have to be hauled out for the survey. How much water collecting in the bilge is normal?