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The first cruising couple I ever met who was sailing an aluminum boat told me an interesting story. They were French—of course. They’d been anchored a long time and had a lot of growth on their hull. When finally they decided to move on, they jumped in the water to scrape the boat clean. When they climbed back aboard they found their previously perfectly dry bilge sump was slowly filling with water. As they searched frantically for the leak, the flow of water suddenly stopped. Mystified, they jumped overboard again to see if they’d missed anything and found a jellyfish clinging to the hull, so they knocked it off. When they climbed back aboard they found the boat was leaking again…
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