I forgot to mention that when the focus of attention is looking for minute
critters you tend to overlook the larger picture.  Swimming slowly along the
small rock walls and closely examining the underneath of ledges by
periodically resting gently on the seabed, I wasn't paying too much
attention on what was ahead until I turned my head and discovered a
two-metre wobbegong gazing through the lens of my face mask.  Undoubtedly
the minor adrenaline rush helped contribute to my warmth!  :-)

Strike