Laboratory aboard oceanic survey vessel in Pacific Ocean. Technician scrapes small amount of mud from a core sample, and examines it under a microscope.
Crewmen aboard oceanic survey vessel, in Pacific Ocean,use sextant to plot sun lines, for navigation purposes.
'Aerial mine laying blockades Japanese shipping' depicts Allied preparations and Operations of the 21st Bomber Command, for aerial dropping of mines in the Pacific ocean to thwart Japanese shipping in World War 2. . Rows of stacked bombs are shown in a munitions dump at Tinian Air Base in the Mariana Islands. Camera focuses on a 2000 pound MK25 mine. Men demonstrate hydrostatic safety devices on the mine, including an extender that holds the detonator away from the booster charge until sufficiently immersed, and a clock delay mechanism. MK 25 transported to B-29 aircraft named Flak Alley Sally. (This is B-29 Number 42-24878 of the 40th Bomb Squadron, 6th Bomb Group, 313th Bomb Wing.) Airmen attach a parachute to the end of the mine. Another inserts the detonator and its extender plus the timer device into the side of the mine. Soluble washers are then placed in arming device ports. Scene shifts to Army and Navy planners working with maps, dividers, and a Weems plotter to mark the target location and mine laying pattern. 313th Bombardment Wing Group Commanders are seen being briefed in a war room. Next, engines are seen starting on a B-29, that then takes off and is seen in flight.(Narrator notes that missions are flown at night, but this one is photographed in the day to show how it is done. View of B-29 cruising above clouds. View from inside the aircraft, of bomb bay slowly opening. View of the target area below. The parachute of a mine opens by a static line as it falls from the bomb bay. Scene shifts to water level closeup of a mine striking the water. ('Presumably a demonstration inserted here.) Final scene shows a Navy Grumman TBF/TBM Avenger torpedo bomber dropping a parachute equipped mine. in the same location.
United States Marines during Allied operations in Guam, Mariana Islands, World War II. LVTs (Landing Vehicles Tracked) underway in the Pacific Ocean. A ship at sea. Smoke rises in the background. A puff of smoke rises upwards. LVTs and LCVPs (Landing Crafts Vehicle Personnel) underway at sea. U.S. Marines loaded onto LVTs and LCVPs as they head for the Guam coast. A LST (Landing Ship Tank) at sea as a LVT enters the LST.
United States Armed Forces Radio Station in Guam, Mariana Islands. Sign reads 'Armed Forces Radio Station WXLI The Pacific Ocean Network'. Radio broadcasting room with a group of native people singing. Broadcaster speaks.
A U.S. Navy Task Force in the Pacific Ocean off the shore of Saipan, Mariana Islands during the Battle of Saipan of World War 2. Heavy Cruiser, USS Indianapolis, CA-35,seen in camouflage paint. Smoke rising ashore, from naval guns firing. Shell splashes in water from Japanese shore battery. The U.S. cruiser and Japanese shore battery exchange fire. Much smoke rising on shore from naval gun strikes. A Tennessee class battleship in camouflage is illuminated by sunlight against dark background. Sunlight frames clouds.
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