Locality: Bikini Atoll--Namu to Boro to Arji~Emon chain. Date: August 21-~Friday. Weather: Fair--increasing winds Water conditions: Increased wave action in P.M. Radiation level(s): McClin~-Boro Island~-The maximum average radiation at ground level was 0.47 mr/hr for both B-y. Underway at 0745 bound for the Bravo-Tewa crater. The ship stopped in the crater and drifted slightly where an oceanographic station was taken. Pumping started at 0800 and by 0835, 30 gallons of seawater from one meter from the bottom had been obtained. Also obtained 32 liters Of water from the bottom with Van Dorn bottles. The bucket dredge was put down and two good samples of bottom silt were obtained. Ship was underway for Boro Island arriving at 0905. As soon as the anchor was down all hands except Gary Lewis went ashore in the copra boat. Lewis took six 30-minute plankton tows (2-5 m) with #6 mesh, half meter nets from the pass south of Boro Island and from near the reef inside Boro Island. In going ashore on Boro the native crew of the copra boat found a very simple landing by going about 1/2 mile north of the reef working through the seaweed of the inner reef, between coral