On one of the submersible's first test voyages, Hawkes' team encountered a group of hammerhead sharks.
Nine, including the scalloped hammerhead, have been added or will be added this year.
"As the hammerhead head has expanded, the degree of binocular overlap has increased with it, " Dr McComb explains.
"This study confirmed that hammerhead sharks have anterior binocular vision, " says Dr McComb.
The scalloped hammerhead shark is to be added to the official endangered species list this year, under the heading "globally endangered".
The birth of the hammerhead (of the bonnethead species, Sphyrna tiburo) at Henry Doorly was as tragic as it was puzzling.
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Tagging studies show that the scalloped hammerhead gathers at fixed sites around islands in the Eastern Pacific Ocean during its long-distance migrations.
Hammerhead sharks are also on the list and some people claim to have seen Great White sharks although it has never been proven.
The Coast Guard cutter ships Tybee and Sanibel are coming from Woods Hole near the Woods Hole Oceanographic Institute, along with the Hammerhead, a smaller 87-footer.
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For many large coastal shark species, the drop in numbers was much greater: tiger, scalloped hammerhead and dusky shark populations have fallen by more than 95%.
The observation takes account of new research that shows hammerhead and great white sharks patrol fixed routes in the ocean, gathering at hotspots to mate or feed.
On Monday, the decision to increase protection for oceanic whitetips, porbeagle and hammerhead sharks had only scraped past the two-thirds majorities required by a handful of votes.
If you were scuba diving and a shark came out of the blue, I'd take my penknife and I'd end that shark's life, fix you up some hammerhead stew.
If you use a boat to retrieve your game, put a spike or hammerhead on one end of your pole to use as a handy defense tool if you encounter the undead.
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