Over 1,000 measurements of the degree and plane of submarine light polarization have been made in littoral waters at depths of 3 to 41m. Using special polarimetric instruments, these parameters were visually measured mainly in horizontal lines of sight at times ranging from sunrise to sunset. Tests showed that observational errors were within ± 5° for the polarization plane, ± 5% for per cent polarization....
Waterman, Talbot H., and William E. Westell. 1956. "Quantitative effect of the sun's position on submarine light polarization." Journal of Marine Research 15, (2). https://elischolar.library.yale.edu/journal_of_marine_research/870