A group of divers trying to take photos of a sperm whale were engulfed in a 30-metre wide bowel movement - otherwise known as a 'poonado'.

Keri Wik was one of the divers caught in the attack which took place just off the coast of Dominica in the Caribbean.

To make matters worse, Keri "didn't even have a snorkel". He says, "Anytime I would take my head out of the water and breath, some water would drip down in to my mouth."

The 'poonado' is thought to be a rarely seen defence mechanism.

This clip is originally from 5 live Breakfast on January 23rd 2015.