Figure F90. Water temperatures in Hole 801C before drilling during Leg 185. Temperatures of WSTP1 and WSTP2 were obtained with the drill string advancing ~30 m into undisturbed water with the WSTP tool latched into the end of the string. The solid line is that of Larson et al. (1993) for temperatures measured between 490 and 540 mbsf. The dashed straight line is drawn to 1.7°C at 0 mbsf (mudline) for WSTP2. The curved line is one possible representation of the temperature where cool water has been mixed with the warm water of the hole. This could have happened during the introduction of the drill string into the hole or by slow influx of bottom water into the hole and possibly into the hydrothermal zone (indicated by horizontal lines).