Just like looking out for overhead power lines it pays to look up when diving.
We teach new divers that they should never put themselves into a position where they can not make an immediate ascent to the surface if they come into difficulty.
It's all very well to be taught to be a good dive buddy, to be vigilant and always at the ready to assist your dive buddy should a problem arise but how often is that vigilance really put to the test.
More often than not when a manageable crisis arises, divers head straight up regardless of their buddy.
So remember to look up, there may be danger overhead.
Photo: Robert Rath, 'Danger Overhead', 1/160s f/22 ISO320 15mm