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The Deepest-Diving Animals on Earth

The Cuvier's beaked whale holds the deepest recorded dive of any mammal at roughly 2,992 metres, while elephant seals and sperm whales regularly exceed 1,000 metres — depths measured by time-depth recorders attached to free-ranging animals, not anecdote.

Updated 25 July 2026

Deep-diving records depend entirely on how depth was measured. Early whaling-era claims for sperm whales lack instrumented confirmation. Modern records come from satellite-linked time-depth recorders glued to the fur or skin of free-ranging animals, and those instruments define what can be stated with confidence.

This list ranks maximum documented dive depths from instrumented records. Duration at depth and frequency of diving are noted where relevant, because a single extreme dive is less informative than consistent deep foraging behaviour.

How this list was compiled

Entries are ranked by maximum depth recorded from instrumented tags on free-ranging animals. Anecdotal or whaling-era depth claims are excluded unless supported by modern tagging data. Dive duration is noted separately because depth and duration measure different physiological limits. Both marine mammals and fish are included where tagging or capture depth data exist.

The Deepest-Diving Animals on Earth

  1. Cuvier's beaked whale

    ~2,992 m (tagged)

    The deepest recorded dive of any mammal, logged by a satellite-linked tag off California.

  2. Sperm whale

    ~2,250 m (tagged); historically claimed deeper

    Modern tags confirm dives exceeding 2,000 metres. Older claims of 3,000+ metres lack instrumented support.

  3. Southern elephant seal

    ~2,388 m (tagged)

    Regularly dives below 1,500 metres when foraging. Among the deepest-diving pinnipeds.

  4. Northern elephant seal

    ~1,700 m (tagged)

    Slightly shallower maximum than southern conspecifics but still among the deepest pinnipeds.

  5. Leatherback turtle

    ~1,280 m (tagged)

    The deepest-diving reptile. Pursues jellyfish prey into deep water.

  6. Weddell seal

    ~600 m (tagged); longer duration

    Shallower maximum than elephant seals but holds breath for over 80 minutes — duration, not depth, is its record.

  7. Emperor penguin

    ~564 m (tagged)

    The deepest-diving bird. Dives last up to 27 minutes on a single breath.

  8. Bluefin tuna

    ~1,000 m (tagged)

    Among the deepest-diving bony fish. Tracks prey through thermoclines.

  9. Sixgill shark

    ~2,500 m (observed)

    Deep-water shark recorded on camera and by tag at mesopelagic and bathypelagic depths.

  10. Sperm whale (typical foraging)

    ~400–1,200 m (routine)

    Most foraging dives are far shallower than the maximum. Typical depth is more biologically meaningful than the record.

  11. King penguin

    ~343 m (tagged)

    Second-deepest diving bird. Forages on mesopelagic fish and squid.

  12. Bottlenose dolphin

    ~300 m (tagged)

    Coastal ecotypes dive far shallower. Open-ocean populations reach greater depths.

Key facts

  • Cuvier's beaked whale holds the deepest instrumented mammal dive at roughly 2,992 metres.
  • Modern tagging data has replaced whaling-era anecdote as the basis for depth records.
  • Elephant seals and sperm whales routinely forage below 1,000 metres even when their maximum dives are deeper.
  • Emperor penguins are the deepest-diving birds, reaching over 500 metres on a single breath.
  • Maximum depth and typical foraging depth differ — a single record dive may not represent everyday behaviour.
  • Leatherback turtles are the deepest-diving reptiles, following jellyfish prey into cold, high-pressure water.

The Deepest-Diving Animals on Earth: frequently asked questions

What animal dives the deepest?
The Cuvier's beaked whale, with a tagged individual recorded at roughly 2,992 metres. Sperm whales and southern elephant seals also exceed 2,000 metres in instrumented records.
How deep can a sperm whale dive?
Modern tags record dives to about 2,250 metres. Historical claims of 3,000 metres or more are not supported by instrumented data.
What is the deepest-diving bird?
The emperor penguin, with tagged dives to around 564 metres. King penguins reach roughly 343 metres.
How do scientists measure dive depth?
With time-depth recorder tags attached to free-ranging animals. Tags log pressure, which converts to depth, and transmit data via satellite when the animal surfaces.
Can animals survive the pressure at 3,000 metres?
Marine mammals collapse their lungs and rely on oxygen stored in blood and muscle myoglobin. Deep-diving species have physiological adaptations including flexible rib cages and high blood volume.
Do fish dive as deep as whales?
Some do. Sixgill sharks have been recorded below 2,500 metres. Bluefin tuna regularly exceed 1,000 metres. The deepest fish records come from trawls and cameras rather than tagging.

Sources

How we check facts: our sourcing standards →

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