"I learned that while that lake goes on farther than it looks like it's going to from the shore, you still can't get to the other side. I'm pretty athletic and I'm a good swimmer. I couldn't even get close to where it looked like there was an opposite bank. There was no way to reach land again other than to turn back and swim to the shore we can access from here," Oliver explains.

"So it's not a way out. I guess we should have known that, considering this place, but I wanted to give it a shot in case things had changed."