Under conditions and circumstances all in favour, the diver relies upon an inevitable infirmity on the part of the oyster for the revelation of its whereabouts. "When man he dibe," says Hamed, "that go'lip quick he shut 'em mout. Carn see 'em. Subpose open mout, man quick he see 'em shove-em alonga beg." At the peril of its life the oyster gapes. "Last night I bin drim. My word good drim.