Video: The fishermen build themselves sleeping in the seabed

A flock of sperm whales about 10 children gather to sleep in an upright position in the Caribbean Sea.

Swiss photographer Franco Banfi found that sperm whales about 12m long suddenly stopped moving and slept in an upright position for 10 minutes when he dived at a depth of about 20m in waters off the Dominican island, Boredpanda day. July 15 reported.

Flock of whales sleeping in the sea.(Photo: Solent News).

"I don't know why they sleep in a vertical manner, maybe they use sound waves emitted from the head to warn the scene," Banfi said. "I am very fortunate to witness this wonderful moment and am grateful for their trust, giving me the opportunity to participate in this event."

The sperm whale, the largest toothed animal on the planet, spends about 7% of its life time sleeping in an upright position. Each time their naps take 6 to 25 minutes.