A Croatian freediver has achieved a seemingly impossible feat.

On June 14 of this year, Vitomir Maričić took one last gulp of pure oxygen and lay down in a pool. There he remained, cool as a sea cucumber, for 29 minutes and 3 seconds.

That's officially the longest held voluntary breath, according to Guinness World Records . Maričić beat the previous record holder by nearly 5 minutes.

Nearly half an hour without air is mind boggling. That's roughly twice as long as a bottlenose dolphin is thought to hold its breath . With that sort of performance, Maričić could give a harbor seal a run for its money .

With each breath, a seal can replace 90 percent of the air in its lungs – but our species can only replace 20 percent. To keep up, we need more breaths to fill our lungs with fresh

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