This frightening encounter of an eel engaged in eight-tentacled warfare suddenly got a lot scarier when it launched secondary an attack on the snorkelers.

Swedish couple, Nicklas, 29 and Elin, 23 were filming their snorkel in Hanuama Bay, Oahu, Hawaii when they came across a moray eel struggling with an octopus.

After the octopus broke free- one tentacle lighter- the huge wound-up eel left in a cloud of ink turned on the holidaymakers like a scene from a horror film.

Military officer, Nicklas said: "Me and my girlfriend was snorkelling early in the morning in the famous Hanuama Bay.

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"We had been in the water for about 30 minutes, we had already seen the eel earlier.

"Mixed opinions, some think it's cool some think we are stupid who got that close."

- Caters News