Colleagues tried desperately to save an Australian marine biologist from a shark during frantic efforts to rescue two divers. The two men were in the water off the southern coast when the shark struck. Rescuers hauled one man into the boat but the shark used its snout to push the other diver back into the water. Shocked colleagues tried to drag the man back into the boat but were unable to save him. The men were looking for cuttlefish eggs with the University of Adelaide about 5km off Grenelg, near the South Australian capital. The local shark experts say that there are plenty of sharks out there and the last thing they would be doing is jumping in the water.