Clean the hull below waterline while underway sounds like an impossibility, but maybe not:
Any volunteers for a little keel-hauling. I understand the process usually removes a few barnacles.
I’d worry about the diver’s air tanks dinging the prop on the way through.
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Sorry to disappoint. it is not that dramatic:
Risking the thread being shut down by reviving an old instead of starting a new thread about the same subject:
Sorry Chief_Seadog and Steamer for any inconvenience.