What mammal can hold its breath for over two hours?

The Cuvier's beaked whale is the mammal that can hold its breath for over two hours. One individual completed a documented dive lasting 222 minutes—more than three and a half hours—while hunting deep below the surface.

Cuvier's beaked whales regularly make demanding dives, often descending beyond 800 metres. Their physiology helps them conserve oxygen: they can slow their heart rate, direct blood toward vital organs, and tolerate the pressure and chemical changes associated with prolonged dives.

The record does not mean every dive lasts that long. Typical foraging dives are much shorter, often around 30 to 90 minutes, followed by brief recovery periods at the surface. The 222-minute dive was an extreme observation.

Sperm whales and elephant seals are also exceptional divers, and blue whales can remain submerged for substantial periods, but Cuvier's beaked whale holds the documented mammalian record for the longest dive.