On the third day of the sightseeing trip, among walrus-laden icebergs, they run into slurry. At the fore, Skipper sticks a boat hook into the water. “There are plenty of critters here,” he says. “It’s like playing grab bag. You’ll always catch something on the hook.” He thrusts the boat hook up and down a couple of times, stirs it in the slush, and pulls it out again. A transparent little rag is impaled on the tip.