Mine was always dry, until I had some work done at a boatyard, which stretched into a cold spell.
When I collected the boat I noticed the water pump running on for far longer than I expected, checked it and found it leaking where the motor joins the body.
I presume the boatyard let the boat freeze, which cracked the pump.
After that I fitted the cheap water sensors alarms, readily available form eBay for a few quid, so I am now warned of any water below the water pump or if it is collecting in the cabin bilge.