Some recent observations in connection with seismic exploration of the continental shelf off the west coast of India are described. A single ship with a single sono‐buoy was used. Five shots were fired at distances up to six miles from the sono‐buoy. Roughly, the depth of the ocean was about 80 fathoms, and a negative temperature gradient existed. The exact times of shots were calculated from the observed arrival of direct waves. The loose sediments are surmised to be about 2.8 km thick, and seismic velocity in these sediments is found to be 1.2 miles per second. The depth of sediments has been calculated from assigning a broad maximum in the records to reflection from the bottom of the loose sedime