An improvised Canadian submarine boarding

What was the strangest anti-submarine weapon that actually worked?

The comic nominee is three undressed Canadian sailors who immediately boarded a surfaced German submarine, though the boarding was a tactic rather than a weapon.

The anecdote concerns three Canadian sailors who rushed a surfaced German submarine while undressed and armed with pistols. They had been resting or changing when the summons came and boarded immediately instead of stopping to dress. One speaker calls the episode the strangest effective anti-submarine weapon, while another insists that a boarding party is a tactic rather than a weapon. The resulting poll is comic, but the story still shows how speed and improvisation could seize a brief boarding opportunity.