■Half hitch

When passing an underwater camera from a boat or quay to a diver who is on the water surface, it is sometimes used by connecting the rope to the camera's strobe arm.
Fold back the end of the rope and tighten it for easy unwinding.
You can easily untie the rope by pulling the end of it.

Go the rope around the object.

Tie the rope end without putting it in the loop.

Completed.
You can easily untie it by pulling on the end of the rope.