A group of Royal Navy sailors braved winds as strong as 90 mph to complete a terrifying training exercise on the Southern Ocean.

Footage from February 1 shows a small patrol boat navigating its way over rough waves whipped up by extremely strong waves.

The filmer said that if the boat had capsized the rescue operation would have been difficult as the sea is freezing cold and they were in a remote location.

Watch this royal navy patrol boat facing rough seas, big waves and extreme winds of +150 km/h (storm force 12) during a training exercise in the Southern Ocean. The cameraman told us that it was likely the wrong decision to go out as it was too dangerous. It could have been a difficult operation to rescue the crew if the boat capsized as the wind was going strong, the water was freezing cold and additional support could not be send over quickly due to the remoteness of the area. Luckily the boat and its crew was able to return safely to the main ship.

With a maximum depth of about 7,434 meters (24,390 ft) and temperatures between -2-10 °C (25-50 °F), the Southern Ocean is known for its tough weather conditions – it is the coldest and windiest ocean on Earth. The latitudes from 50 to 70 degrees south are also known as the "Furious Fifties" and "Shrieking Sixties" due to strong winds and large waves caused by the winds blow that blow around the globe in those areas.

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