List of Figures: Figure 1: Seasoar Cruise Track: May 1991 - May 1993. Heavy lines denote when seasoar was actually being towed. Heavy Circles are location of subduction moorings. Figure 2: Seasoar vehicle with sensors. Figure 3a & 3b: Bobber location at the time of Seasoar mesoscale survey determined from ALFOS data. Figure 3a - Subduction 3. Figure 3b - Subduction 4. Figure 4: One hour summary plots of Seasoar track. In the upper plot, the dotted line represents pressure over a 0-500 db range vs time. The solid line represent sigma-theta over range of 25 - 27.5. Figure 5: Theta Contour plot of gridded Seasoar data along transect 2 of Cruise 3. Gray areas denote unavailable data. The darker lines represent average sigma-theta, during Subduction 1, where the bobbers were deployed. (see Fig. 7). Figure 6: Example Summary plot of Pressure, Theta, Salinity and Thickness vs. Sigma-theta. See Appendix A. Figure 7: Representative range of bobber movements during Subduction 1. Figure 8a - 8i: Representative contour maps of theta, pressure and thickness for density levels 26.5, 26.7, 26.9. Each map contains a mean and standard deviation (STD) of the observed property over the entire star pattern . See Appendix D. Figure 9: Representative map of ADCP velocities on a star pattern at density levels 26.5 (fig 9a) and level 26.7 (fig 9b). See Appendix E. List of Tables: Table 1: Cruise names, dates and Chief Scientists for Subdcution experiment. Table 2: Mean locations, start and end times of star patterns and sections. Table 3: Mean and standard deviation of theta, pressure and thickness on density surfaces 26.5, 26.7, 26.9 for all star patterns.