- pertaining to the abyssal zone (2000-6000 meters depth).
- abyssal plains
- a flat, almost level area occupying the deepest parts of many of the ocean basins at a depth of 10,000 - 20,000 ft (3,000 - 6,000 m).
- animal-mounted instrumentation
- instrumentation for the purpose of sampling or sensing environmental conditions that are deployed as part of a satellite telemetry tracking tag or by being attached in some way to an animal.
- apex predator
- Apex predators (also alpha predators, superpredators, or top-level predators) are predators that, as adults, are not normally preyed upon in the wild. These species are usually the top of the food chain and play a crucial part in determining the health of their ecosystem.
- any member of the phylum Arthropoda, the largest phylum of animals. These organism are characterized by having a jointed or segmented body covered by a chitinous exoskeleton. This phylum includes insects, crustaceans, arachnids, and others.
- scientists specializing in the field of astrobiology, which is the study of life in space. These scientist combine the fields of astronomy, biology, and geology to study the origin, distribution, and evolution of life not just on our planet, but, perhaps, on others as well.
- autonomous baited landers
- an oceanographic research tool that is essentially a weighted frame which supports a host of scientific instruments, cameras, etc that is lowered into the sea. These landers are placed in study areas and are left to record data, take photographs etc for a time period before being later recovered. In some cases these landers are baited in order to attract sea life for photography or video purposes.