“I never trust the mind of an iceberg,” Cecil Stockley told me. Dave Boyd said his safety rules depend on which type of iceberg he’s dealing with. “A tabular is generally pretty mellow,” Mr. Boyd explained as we floated off the coast of Newfoundland, referring to icebergs with steep sides and large, flat tops. Another clue, he said, is when a flock of seabirds perched atop the ice abruptly peels away en masse. They can feel the tremors that Mr. Rogers is straining to hear.

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Persons: “, ” Cecil Stockley, Dave Boyd, Mr, Boyd, ” Barry Rogers doesn’t, Rice, Rogers Locations: Newfoundland