By Samantha Grillo @_samanthagrillo
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Photographer Alexandre Socci snapped the incredible images of diver Karina Oliani in Bonito, Brazil while filming her television series - Wild Ocean With Karina Oliani.
It took Karina four days to find the giant predator that she estimates weighed between 300 and 400kg (63 stone).
The 33-year-old said: “At first I was terrified by its size - I saw a huge head but could not see the end of its body.
“It has always been a dream of mine to find an anaconda and when I got very close to it I felt very lucky.
“The anaconda was one of the biggest ones ever filmed underwater.”
Karina has been diving since she was a child, became a certified open water scuba diver at 12, and has been a professional diver since 2002.
She has swam cage-less with Great White sharks and has climbed some of the world’s tallest mountains, including Mount Everest.
Her most recent adventures have been filmed as part of her new television series that follows her to the depths of the ocean encountering amazing sea creatures.
This giant anaconda was spotted in an underwater cave system that lies underneath the crystal clear waters in Bonito.
Anacondas are one of the largest snakes in the world and spend most of their time underwater making them very hard to find.
“Because of is size and knowing how agile they are underwater, this one could have killed me easily,” Karina added.
“They kill their prey by constricting them and the more you try to escape the more they try to squeeze you.
“I had my friend bring a good knife for safety if we needed it - but that was the only precaution we took."
But once Karina spent a few minutes close to the anaconda she realised that the giant snake was not looking to hurt her.
“I knew it was a female because of its size - females are much bigger," added Karina.
“We were definitely not on her menu but it is a wild predator and you should not approach it in a way that makes it feel threatened.
“At first she was very shy and after about 20 minutes she got progressively less worried with my presence and we both ended the dive comfortable around each other.
“This encounter was one of the most spectacular and surprising for me because anacondas are not easy to find - they hide well in water.
“There are many myths and stories that depict anacondas as man-eaters - but they definitely are not.”
Wild Ocean with Karina Oliani will be aired next year.