The first true oceanographic expedition beginning in 1872 and lasting four years.

a remotely measured physical quantity in the depths of the sea or the heights of the atmosphere

a form of artificial echolocation using sound waves to measure distance

a large, bell shaped submersible lowered from a ship in order to explore or work on the sea bottom

a diving system that permits a diver to carry a supply of air for extended periods without any connections to the surface

A diving system used for extremely deep dives that reduces the medical hazard of breathing normal air under high pressures.

An underwater outpost that allows people to live and work on the ocean bottom for long periods of time without diving gear

the earliest untethered deep sea ocean exploration vehicle that provided a limited ability to explore the sea bottom

The first deep-water manned submersible

The basic Bathyscaphe concept, but much-improved model

A manned submersible designed to a small crew to extreme ocean depths for scientific research

An unmanned, tethered, robotic submersible used to work on the ocean bottom, especially on deep-sea oils.

an unmanned, untethered, submersible vehicle that uses AI to control its operations

any type of unmanned submersible vehicle