The Aloha Scuba and Diving Company had a one of a kind experience when they were approached by a massive shark while swimming near Oahu.
Ocean Ramsey told the Honolulu Star Advertiser that the markings on the animal match those of Deep Blue, a shark tagged by researchers about 20 years ago.
The shark, which was nearly 20ft long and weighing about 2.5 tons, appeared relatively docile in the video taken by the divers as they swam alongside it. One diver even stroked the shark's side.
“She was just this big, beautiful, gentle giant wanting to use our boat as a scratching post. We went out at sunrise, and she stayed with us pretty much throughout the day," Ramsey said.
"It was an absolutely breathtaking experience, and really quite humbling to be in the presence of this great shark," diver and photographer Kimberly Jeffries told USA Today.
Watch the unbelievable video above.
Different kinds of sharks
Silky sharks in Jardines de la Reina archipelago in Cuba. (Photo via Getty)
Snorkelling with Whale Sharks at Exmouth, Ningaloo Reef, Western Australia, the largest fish in the ocean, and a vegetarian. (Photo: Anthony Marsh, Alamy)
Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. (Photo via Getty)
Caribbean reef sharks, Carcharhinus perezi, dusk in bahamas. (Photo via Getty)
The sharks of Tiger Beach, Bahamas. (Photo: Greg Amptman, Shutterstock)
Frenetic activity of Caribbean reef sharks Carcharhinus perezii . Sharks were attracted by chumming the area. (Photo: Stephen Frink, Getty)