Expedition yachts are often clunky-looking boats, built for crossing oceans rather than marina-hopping around the Mediterranean. Many are loosely based on offshore trawler designs—think the TV show Deadliest Catch—with long-distance, seaworthy hulls and simple, Spartan interiors. Others may resemble traditional stacked wedding-cake superyachts, but with ice-class hulls, oversize fuel tanks, and voluminous freezers that enable them to venture farther and longer than most pleasure cruisers can. The Italian desig…