A couple of scuba divers found a huge mammoth bone dating back to the ice age.
Pals Derek Demeter and Henry Sadler were out diving in Peace River, southwest Florida last week when they found the whopping 22kg (50lb) fossil.
Speaking to Fox35, Derek said: "Henry is my dive buddy. He yelled out to me, said, 'Hey, Derek. I found something! Oh my goodness!' It was really, really cool."
The pair believe it's a thigh bone - or femur - of a mammoth from the ice age, which would make it between 2.5 million and 10,000 years old.
Derek said: "This one's much more dense, so we kind of think it's somewhere in the middle. Probably 100,000 years old."
Although it's hard to tell the exact age of the bone, the men say it is very well preserved as it was protected by sand.
Alongside the bone, the men also found parts of a now-extinct shark and the tip of a tooth belonging to a sabre-toothed tiger - so not a bad day out, all in all.
Derek, who is director of the Seminole State Planetarium, added: "The thing I love about it is just like astronomy, it's time travelling. It plays with the imagination so you go, 'Wow, what was going on at this time?'"
Posting about his find on Instagram, Derek wrote: "My friend and I uncovered this giant Columbia mammoth leg bone this weekend while scuba diving in the Peace River. It weighs a ton but incredible discovery!
"In Florida between 2 million to 10,000 years ago Florida had these giants roam the prehistoric savannah grasslands."
The friends often go out on the hunt for ancient fossils such as this and have had other successes in the past.
They usually donate anything they find to museums, but this bone will go on to sit in teacher Henry's middle school classroom, so the pupils can learn more about the ancient world.
He told ABC 7: "I think I'm going to keep this one in my classroom.
"Just because it's such an amazing piece of history and it gets the kids so excited and it's just so tangible."
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