The sperm whale is the canonical whale, its form immortalized by books and drawings centuries old. When you ask a child to draw a whale, it is likely that what will come out of her developing mind most likely resembles a sperm whale, an animal with a huge, box-like head and tiny pectoral fins whose evolution seems to defy logical explanation

Impressions from Antarctica, photographed by Michael Aw and Göran Ehlmé

Lake Thingvellavatn on Iceland. In more than one sense this place is wondrous and mystic. Geologically, the Thingvellir area is part of a fissure zone running through Iceland, being situated on the tectonic plate boundaries of the Mid-Atlantic Ridge. The faults and fissures of the area make evident the rifting of the earth’s crust.

Sliding into brackish water riddled by a seasonal downpour might not be everybody’s idea of a week-end in the Wild West...but for the frustrated winter diver that I am, there is sometimes nothing like the peaty waters of Connemara.

Cozumel combines the great reefs that one might find at the best dive spots around the warm Mexican Gulf waters with the laid back island life, where everything is close enough..

Viewing a torrent of flowing liquid turmoil while safe and dry on shore is enough to make anybody hesitate about signing up for a dive charter in the Skookumchuck Narrows. This is also the place where rushing tidal currents commonly reach impressive speeds of 14-16 knots (30 km/hr)!