The research platform Flip and the research vessel Horizon returned to San Diego on October 7, 1963, after completing 46 days at sea, the longest consecutive time spent between ports for either vessel. The ships spent 27 days on station near the western end of the Mendocino escarpment at 39°30′N, 148°30′W. Measurements of surface waves, internal waves, and seismic waves were made from Flip during the time; hydrographic casts, BT observations, PDR soundings, and gravity cores were made from Horizon. Flip was maintained in a vertical position the entire time on station and was resupplied with fresh water, fuel, and perishables by high line from Horizon. The duration of the cruise was such that Horizon moored next to Flip for four days in order to conserve fuel.