(Yes, T'ursday. Trying to get a little onomonopeaic there.)
Advanced Unmanned Search System - One of the world's first complex robots able to roam the seabed without a tether. AUSS was begun by the American Navy in 1973 for wide-ranging hunts for lost gear down to depths of 6.1 km (3.8 mi). Seventeen feet in length, it made 114 successful dives for the Navy before being turned over to private industry in 1994.
Akademik Mstislav Keldysh - The 422-foot mother ship of Russia's MIR twin submerisbles and one of the world's largest oceanographic research vessels.
Albatross - A large, web-footed seabird that spends most of its life in the ait.Algae - An ancient group of primitive plants ranging from unicellular Phytoplankton to kelp forests.
Alvin - The world's first submersible able to roam the deep seabed. Completed by the American Navy in 1964, and run by the Woods Hole Oceanographic Institute, it was originally rated for a denth of 1.8 km (1.1 miles) but was eventually strengthened so it could descend down to 4.5 km (2.8 miles). The 25 foot craft can carry up to 3 people.
Amphipod - A small type of marine crustacean, swarm of which can move across the deep seabed like hordes of insects, feeding on carrion.
The Universe Below: Discovering the Secrets of the Deep Sea, William J. Broad. Simon & Schuster, 1997