White Sea

One of the world's most extreme dive destinations — a frozen inland sea where beluga whales glide beneath 1.5 metre ice sheets, harp seals hunt polar cod, and rock walls blaze with orange and pink invertebrates in near-freezing water. Ice diving here is a specialist pursuit requiring drysuits and ice-dive certification, rewarded with unearthly clarity and megafauna encounters that no warm-water destination can match.