One fisherman reeled in quite a bit more than he bargained for.

Borja Campos, 26, was spear-fishing with a friend off the coast of El Hierro in the Canary Islands when he caught a grouper that weighed more than 57 pounds (26kg) on Nov. 9. 

Campos and his friend Oscar Fleitos, 22, were on a camping trip and decided to fish. But after about four hours without catching anything, they almost gave up.

That’s when Campos saw a slightly smaller, 13-pound grouper that swam into a cave, he told SWNS

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"Just before I got out, I spotted a small grouper heading into a cave, so I thought I’d follow it,” Campos said. 

“That was when I saw a second grouper come from nowhere and follow it into the cave -- and my heart started beating really fast when I realized how big it was."

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According to SWNS, Campos swam almost 60 feet (18m) below the surface of the water when he saw the fish and pointed a flashlight at it. 

Borja Campos, 26, spotted this huge fish in a cave while trying to chase after a smaller fish. (SWNS)

“The fish was staring straight back at me, and I couldn’t believe it when I managed to catch that precious 26kg grouper,” Campos said.

He added that internally, he was “screaming with happiness” when he saw the fish.

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Fleitos filmed the moment Campos brought the fish above water.

Campos had been fishing for four hours without catching anything before he spotted the 57-pound grouper. (SWNS)

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“Oscar started filming me as I brought it to the surface because he couldn’t believe how big it was either,” Campos said. “It was a wonderful day.”