Chris & Monique Fallows / Blue Shark (Prionace glauca) tail, Cape Point, South Africa.

Chris & Monique Fallows / Blue Shark (Prionace glauca) viewed from below with Pilot fish (Naucrates ductor) Cape Point, South Africa.

Chris & Monique Fallows / Blue Sharks (Prionace glauca) and Yellowfin tuna (Thunnus albacares) Cape Point, South Africa.

Alex Mustard / A close up of a blue shark (Prionace glauca) as it investigates the camera beneath the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August.

Alex Mustard / Blue sharks (Prionace glauca) cruise beneath the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August. Winner of the Coast and Marine category...

Alex Mustard / Blue shark (Prionace glauca) near the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August. Digitally manipulated to improve composition see 1...

Alex Mustard / Blue shark (Prionace glauca) swimming near the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August. Highly commended in the Portraits category...

Alex Mustard / Blue shark (Prionace glauca) as it cruises beneath the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August.

Franco Banfi / Great Blue shark (Prionace glauca) profile portrait viewed from slightly above, Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Great Blue shark (Prionace glauca) viewed from above, Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) viewed from below, with Snell's window effect, Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) Pico Island, Azores, Portugal, Atlantic Ocean, July