Slough, Buckinghamshire - now Berkshire.
SV. Mr George Cook, an inventor, sitting in his home made submarine. CU. Cockpit showing control column and gauges. CU. Mr Cook in submarine. CU. Flag on front of sub, pan down to the name on the bows "Explorer I". CU. Stern of submarine showing propeller and rudder.
SV. Mr Cook in his submarine on surface of lake. CU. Submarine as it now submerges, Mr Cook is wearing frogman's outfit. CU. Two men wearing frogmen outfits on bank watching. SV. The submarine as it surfaces. CU. Mr Cook takes his goggles off.
Lake Negre, French Alps, France.
GV. Lake Negre where French scientists begin seismic tests. A large explosion takes place and a column of water shoots into the air. GV. The lake. GV. Helicopter landing supplies of TNT explosive for further blasts. CU. Supplies in net under the helicopter. CU. Men placing material into large craft which could be used for the explosion. CU. Men in boat. GV. Large pontoon in middle of the lake. CU. Photographers GV. The lake and another large explosion takes place.