A snorkeler found herself surrounded by some aggressive blue sharks off the coast of Cornwall in the UK on Friday.

A video showed her being repeatedly bumped and nipped by the small sharks until she decided to get back to the safety of the tour boat.

"I have swum with Blue Sharks before and was super excited to have the opportunity to do it again," she explained.

"They were particularly aggressive whilst feeding this time...I think there were about three in particular that repeatedly bumped and barged me, some even test biting me and the camera with their mouths," she added.

"They then circled the boat ladder so I couldn’t get out!! When I finally did get out, they breached and came up the ladder too!"