A group of divers who made unlikely friends with sea lions and seals have shown just how dog-like the marine animals can be.
Cameraman William Drumm, 34, and fellow scuba fans Ryan Miller, Maxwel Hohn and Roseanne Keat, have experienced many memorable dives over the years.
But their most memorable came as they explored waters in Monterey, California and Vancouver, British Columbia.
The four friends were hounded by seals and sea lions, who were caught on camera playing with the group and acting more like dogs than fearsome marine predators.
William, who also an ocean photographer, recorded hilarious footage from some of his many dives with the playful sea lions and seals.
William said: It is so much fun interacting with these amazing animals.
They are so intelligent and social and you can see them making decisions and figuring things out.
They behave so much like dogs, it really is something else.
The remarkable footage varies from the seals and sea lions bobbing on the sea surface lazily after eating to the mischievous animals nipping at and playing with the divers.