Have had a series of drying mud berths with both O******s and good old reliable shafts.
Have never bothered to close raw water seacocks or other below the water line stuff ever.
Have never ever had any problems with plugs of mud or anything else clogging up heat exchangers or bog systems.
Only reason to shut valves would be peace of mind if inlet hose fails
We do however have seasoned boaters in our club who will not under any circumstances go to any destination which dries out.
Go figure !
2 x Sarah T. On their shared mud berth just afloat as tide floods.
P33 was on the devils egg whisks and when sanity finally arrived the Transocean is on shafts.
Is that "The Command House" and Lloyds in the background? I used to work in one and drink in the other many moons ago.