Figure 38. Graphs showing time series of optical backscatter and transmissometer attenuation from OBS mounted 1.18 meters above the bottom and 25-centimeter transmissometer mounted 2.75 meters above the bottom. Dashed line marks time when tripod tipped over by strong waves and currents. Dotted lines mark times when optical sensors were cleaned by divers. Refer to the Abbreviations and Symbols section.