I agree with the above, but I have had the following problem recently, so another thing to check out!
I have realised since having a leisure battery moved that was covering the weed hatch, that the top of weed hatch is underwater unless the water tank at the front is utterly full. I had been wondering why water came in on some trips and not on others. Someone has obviously shortened it at some point!
It also isn't sealed, as heading upstream on the Thames into the wind recently, I had to push the engine, and the prop sent water splashing against the hatch lid, and yes it poured in. I left the bilge pump on, and it cleared itself, where I usually only use it occasionally.
Just a thought!
Just to add, I also have a wet gas locker - separate from the engine bay obviously, but of course the holes are only just above the water line, and there are holes below too, to allow it to be wet!. A problem would occur if the locker rusted through.....