The Monterey Bay Aquarium Research Institute (MBARI) is using two remotely operated vehicles (ROV) to search for solid gases at 4,000 meters below sea level. The article is mostly about the design of and protection for precision instrumentation used in the search. This includes a discussion of laser Raman spectrometers and how they are enclosed in three pressure housings with a single-board computer, power components, and the 100mW 532 nm excitation laser; to survive and function in the unpredictable deep marine environment.