Data on the times and frequency of dives by Atlantic alcids have been reviewed by Bradstreet and Brown (1983), who pointed out the need for more such information for this family of birds. Scott (1973) presented data on diving times and depths for marine birds, including the Pigeon Guillemot (Cepphus columba), observed along the Oregon coast. Carter and Sealy (1984) found Marbled Murrelets (Brachyramphus marmoratus) in fish nets set at depths of 8 to 10 m, while Piatt and Nettleship (1985) recorded Black Guillemots (Cepphus grylle) caught in nets at 50 m and diving times for that species of up to 112 seconds in water 35 to 45 m deep.