Above a cold, swollen sea, a sunny day gives way as clouds wrap the sky in silver gauze. Rain, as always, is coming. The boat slaps a drumbeat as we motor from Valentia Island, just off Ireland's southwest coast, toward the stone teeth of unnamed isles farther offshore. Bogged down by weights and a cumbersome dry suit with its puzzle of hoses, I can't bend to put on fins, so one of our four-diver crew does it for me. Approaching the 300-foot (90-meter) rocky sky-rises, the pilot throttles down, and I am escorted to the boat's edge, the waves bucking below. When the sea calms for a moment, I press my mask to my face, breathe shakily into the regulator, and jump.
Diving is hardly a typical pursuit in the Emerald Isle, where leaden skies, serrated shorelines,and soggy velvet hills tend to send visitors crawling to the nearest pub. What incentive could there be to skip the frothy pint and splash into a stretch of Atlantic sure to be skeleton cold and nearly as lifeless?
In a word, surprise. Sinking beneath the swells into 52-degree (11°C) water, I'm floored by anemones that gleam as pink as bubble gum, as green as a lime snow cone, so orange I can almost taste the juicy pulp. Flatfish with their eyes topside wear mottled camouflage so spot-on that they hide in plain sight. Childlike gray seals nibble another diver's fin before rocketing out of reach. Their home, the Skelligs, is a pair of drip castles of red sandstone frosted with guano and feathered with thousands of gannets and puffins. The larger isle, Skellig Michael, rises over 700 feet (210 meters) above water and plunges another 160 (49 meters) below, merging with the continental shelf. To dive at the kelp-covered base of this rock with the legendary selkies as companions, then ride my exhaled bubbles to the surface, is a rare privilege.
It's a pair of warm flows—the North Atlantic Current from the Caribbean and the Shelf Edge Current from Portugal and France—creeping up Ireland's west and, indirectly, east coasts that keep winters and waters relatively mild and stable, a boon for marine life. Where I dove on the western side, animals, many at the extremes of their ranges, meet in clean temperate Atlantic waters that wash shores of varied rock types and topographies from exposed cliffs to sheltered coves. Habitats, as a result, are assorted and ample in the intertidal zone and on down the gently sloping shelf. Life explodes into every niche.