The Oregon Parks and Recreation Department says sneaker waves are impossible to predict and come without warning. The wave washes back to the ocean just as fast as it surges onto the beach.
Jim Cahill says: "I went from this moment of great video. I got a nice splash off the rocks to uh oh, I might get my boots wet to O-M-G an adrenaline rush for survival. Instant man vs wild and I was in trouble. For a moment there, I was in trouble."
Cahill says the water quickly surged up on the beach and he was waist deep in water. He says that wasn't the scariest part.
Cahill says: "But then when the water comes back towards the sea, thats when I felt like I don't have the strength to continue standing. I thought I was going down."
Cahill says even though he was alert, the sneaker wave still took him by surprise.
This morning, he still walked his dog at McVay Rock, just on higher ground.
Cahill says: "I think it's a good reminder to everybody that this ocean we love so much it's quite a monster when it surprises you."
The Oregon Parks and Recreation Department says the best wasy to stay safe aainst those sneaker waves is to stay alert and never turn your back on the ocean.