Install a high water alarm. Sooner you know the better.
One of the cheapest and easiest to install. I always put one in. It can be hot glued to the top of a bilge pump. A float switch in a loop with a motorcycle horn in the cabin and hooked up straight to the battery.
Always have at least one bilge pump connected to the battery with a fuse and no switch. I've asked Nick to do that but he said no. But many of the marinas now inspect for this before you can moor there. Shoreline inspected my Bavaria 38 but I already did that.
The nice thing about a motorcycle horn is anybody around will be annoyed enough to call the owner.
If yo see a boat in it's mooring and the pump does not stop running do something because that boat is sinking.
I called a guy I knew from the marina whos boat was always listing about 10 degree to Starboard. He got pissed and said a little water won't hurt anything. Then one afternoon I notice the pump flowing constantly. Call the drunk again he yells at me that that's what it's supposed to do. Nope!
So I call the marina office and they check it out and they call the owner and get they crazy had enough treatment so he storms down the the marina and in time to see the fireboat and guys on board putting a float around his boat.
The fool had an older boat and didn't close the head drain and was already overflowing. I was already picturing the band playing as it went down.
They saved it and towed it to a yard. The oil gas and what ever else that was on board was prevented from becoming a stain on all the boats waterlines around it.
The drunk told everybody that he thought I sunk his boat and I ruined thousands of dollars in fishing gear. I know he had a plastic tool box and three Penn 500s on ugly sticks and one of which was a spinning rod. Some people should not have boats like some people shouldn't have kids.
High water alarms are not just for you they are also for your neighbors.
Install a high water alarm. Sooner you know the better.