Twelve stations were worked from 6 to 8 July 1965 aboard the R.S. SARDINOPS in a tight grid of three lines between Cape Town and the Cape of Good Hope, one line of four stations being worked each day. One subsurface current observation was made at each station with a Pisa Current Indicator (Carruthers Jelly Bottle). Results show three cyclonic eddies, with upwelling at each eddy. Surface flow, as shown by ship drift, bears no relationship to subsurface flow, possibly because of the strong thermocline throughout the area.
Duncan, C. P.. 1966. "Modifications of the Pisa Tube and some results from observations off Cape Point." Journal of Marine Research 24, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1069