Fishermen film 'incredibly rare experience' with two ancient sharks

Three fishermen have filmed an unbelievable encounter with two extraordinarily uncommon deep sea sharks, practically 50 kilometres off the US coast.

Val Costescu was fishing along with his mates, Andrew Chang and David Stabile, off San Diego in California final Sunday when two shapes approached their boat from the blue.

The trio grabbed their cameras and filmed the encounter, not realising the beasts have been megamouth sharks – an elusive deep sea shark.

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The video, filmed off San Diego, is the primary recorded time two megamouths have been filmed collectively. (Val Costescu, David Stabile, and Andrew Chang)

"We did not know what the sharks have been at first," Costescu advised 9News.com.au.

"As quickly as we bought the species confirmed we have been shocked to be taught that we had an extremely uncommon expertise.

"It was loopy."

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The primary identified megamouth was found by US Navy crew.(US Navy)

Megamouth sharks have been first found in 1976, by a US navy analysis vessel working in Hawaii.

As such, not a lot is understood concerning the species.

It is believed the animals can dive to depths of 1000 metres - perhaps even deeper - and reside up too 100 years.

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The world's most weird deep sea sharks

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Just one megamouth shark has ever been reported in Australia.

It washed up in Mandurah, WA in 1988.