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• n  an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder

• A fortnight ago it fell to Piedra, who is also a good amateur skin-diver, to dive to the sunken hull of a Cubana airlines Viscount that crashed and killed 17 of 20 passengers when .
• He is a "skin-diver," and loves nothing better than swimming under water with mask and air cylinder.
• But I hear he's a terrific skin-diver.

• aquanaut