A person who works underwater and studies undersea plant life is called a marine botanist or a marine phycologist. They specialize in researching the plant life found in oceans, seas, and other underwater habitats.
Tech Person
a slave
An underwater camera, is a camera that works underwater.
Employee
someone who works for a business
hydrologist
A mathematician
moofer
A Chronogist
A BarMan
Railroader