The Jungfem Passage Sill at a depth of 1815 meters is the controlling sill for the deepest water exchange between the Atlantic Ocean and the Venezuelan Basin of the Caribbean Sea. Data from moored current meters and temperature recorders, STD's and hydrographic stations obtained during March and April 1972 are interpreted as indicating an average net flow of 56 × 103 m3 sec-1 of deep Atlantic water into the Caribbean Sea. Current speeds as high as 32 cm sec-1 were recorded on the sill near the axis of the inflow, and the average velocity during 38 days was 20 cm sec-1....