Here's an interesting piece from a recent survey of an Columbia River bow picker - in the event that the vessel's prop or rudder became fouled with a net - a metal tube (lower picture) installed through the hull - just above the prop allows the crew to inspect the underwater hardware (the top picture is what the tube opening looks like outside the hull) - and if they were lucky - provide a means to untangle or cut-away the net....the tube is about 5" in diameter and is capped with a screw-in plug ...you just see this feature any to often.
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