Incidental catches of 12,243 Common Murres (Uria aalge), 875 Altantic Puffins (Fratercula arctica), 36 Black Guillemots (Cepphus grille), and 9 Razorbills (Alca torda) were recorded off Newfoundland during the summers of 1980-1982 (26,445 net-days of fishing effort). Most catch occurred in stationary fill nets set on the sea floor at depths of us to 180 m and revealed that murres, Rozorbills, puffins, and guillemots can dive to depths of at least 180, 120, 60, and 50 m, respectively. Diving ability appeared to be directly correlated with body size.
Diving Depths of Four Alcids
Piatt, J.; Nettleship, D. (1985). Diving Depths of Four Alcids. The Auk, 102, 293-297.