Film: 5728

War + Military | 1960 | Sound | Colour

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Synopsis:

The methods and counter methods of undersea warfare used by the Royal Navy - mines, minesweeping, submarine attack and submarine detection 1960's

Red dawn or sunset over the sea. The sea with ships in the distance. Gently undulating waves. More waves. More and more waves rolling over against the shore. Another angle - bigger splashes. Bigger waves. Waves crash against rocks. Crashing waves. A calm sea. Sea level view of waves. A rocky sea bed. More - as voice-over tells us men can hide themselves and their weapons. A mine is dropped into the sea and sinks to the bottom. Close up of the mine resting on the bottom. A mine is torpedoed or jettisoned from a boat's hull. A sailing boat laden with cargo. A mine rests on the bottom - it stays there as long as desired till it floats up just below the surface.

A mine floating up just below the surface. Close up of the mine. A thin tubular mine - a grounds mine - on the seabed. Where it stays until detonated by various means. Montage of the mine's mechanism counting days and minutes until it becomes active, and its instruments which listen for engine noise and then detonate it. (The mine might also be triggered by change in sea pressure or a ship's magnetic influence.) water explodes into the air when a mine detonated. Four mine-sweeping ships at sea. Seamen on deck prepare to seep buoyant mines. The sweep wire is unwound, it is trailed into the sea where it cuts mine moorings and releases mines to the surface. A mine pops up to the surface. On deck, marksmen shoot the mine with armour piercing bullets. The floating mine. The marksmen. The mine again. A mine-sweeper deals with influence mines from a distance - it uncoils electric cables which will trigger the mines. Seamen ease the cables over the ship's stern. An acoustic hammer - a metal cylinder to us - is lowered over the ship's side to detonate acoustic mines. Rattling pipes are lowered to trigger acoustic mines at other frequencies. Dial showing amperage. An acoustic hammer , noisy under water. A huge plume of water from an exploding mine. Mine sweepers sail in formation. Profile of one, M1204. The other ships. They sail several times over the same spot. Profile of minesweeper M1115. An outboard dinghy next to the ship. Officers give orders over a microphone. The dinghy and three crew - divers - leave the ship. Closer as they sail away. The minesweeper hull seen from underwater. Officer speaking into microphone. The dinghy as it gets further away. Officer again. Dinghy crew arrive over the mine. Officer again. Dinghy crew drop a time bomb. Officer again. A dinghy crew man checks his stopwatch and speeds away from the site. Mine and water explode. A dinghy crew man puts goggles on and prepares to dive, then dives. A ground mine on the sea bed. The diver or frogman swims in the sea. He inspects closer. Other divers dive from another naval dinghy. Closer the divers in the water - here are ship volunteers whose main role is doing something else. Underwater they swim around the ship's propellers.
Four divers step into the sea in a foreign harbour, a naval ship F18 in the background. Underwater they inspect the keel. A professional clearance diver on a small boat confers with surfaced divers. Young divers in training at Portsmouth - they are pulling on wetsuits as quickly as they can. Closer. Their instructor times them. The trainees still struggling with their suits. The instructor urges them on. The trainees wade through mud. The instructor again. The trainees on their hands and knees in the mud. The instructor watches them sitting down. The trainees crouching in the mud. Again. And again. Again, totally covered in mud. A trainee dives feet first into water from a board. Others queue for the board and step off. The instructor shouts from below. Another lad steps off the board and splashes into the water. Others jump. On a quayside, trainees put on their diving gear. One checks his air and goggles. Another's harness is tightened. The trainees wade into the sea. One loosens rope which attaches them all together. Trainees in the water. Their instructor shouting. The water. Divers on a ship's edge at sea, training for deep sea diving. A diver underwater catches hold of a rope. A diver works on a ground mine, trying to open it. A rocky seabed covered with plants. Rusted metal from a sunken ship, hardly visible. Similar. Again. The bow of a submarine in the depths. Its periscope tower. On the surface, a periscope pops up through the waves. Underwater again. Above, as more of the sub surfaces. Underwater again. Part of the sub's hull. Inside the submarine, crewmen working on the engines. On the surface, air released from the sub. Submarine's engine room and crew again. Hand on a control. Crew looking at dials and counters. Closer, of the electricity counters. An engineer speaks into a radio. On the surface, next to the periscope is the snort pipe for the engines - these are run near the surface to recharge the submarine's batteries. The sub's radar operator. Above, up pops the radar aerial. A radio or radar operator takes notes. Sonar operators listen for other ships. The operators' faces. Crew in the control room. The commander or captain looks through the periscope.
A ship is sighted. The captain downs periscope. The lieutenant shouts orders. The captain orders "Prepare to Fire" and "Up periscope". The lieutenant gives bearings. The captain checks the periscope. Lieutenant gives bearings. A crew member gives readings. Montage of captain and crew as the order to fire is given. A torpedo is launched. And another. Captain and crew in the control room. Closer of two crew. Control room again. A crewman or the captain checks a stopwatch. Another crewman waits. The captain checks his stopwatch. The lieutenant also checks a watch. Another stopwatch. The control room as a bang is heard and the captain ups periscope. The sub seen underwater. Seen hazily from a distance. The seabed while the voice-over / narrator talks about sonar being used to detect submarines. A shoal of fish. A shipwreck which is hard to see. Three sonar operators. Close up of one. The sonar operators seen from behind. Strangely dressed crew in the attack control room. The sonar operators again. Two men move a homing torpedo on a trolley to a WASP helicopter. They attach it underneath, next to another one. The sonar operators and another crewman. A hooded man speaks into a radio. The Royal Navy Wasp helicopter prepares to take off. The helicopter's tail. The helicopters blades start turning. Hooded man again. The helicopter, from H.M.S. Aurora, ready for lift off. It takes off from the deck of a naval ship. One of the ship's control rooms. The helicopter flies high. Its pilot looks out over the sea. The sub sonar operators again. The sea. The helicopter. The ship's control room. The helicopter overhead. The control room again. A sonar operator. The helicopter pilot. The control room. One of its crew. The helicopter pilot. He releases a homing torpedo. It falls with the aid of a small parachute and plunges into the sea. View from the helicopter as it arrives back at ship. Crew rush to secure the wasp as it lands on deck. On the deck of a larger ship - a destroyer - a larger helicopter, a Wessex, lifts off. This helicopter takes its own radar with it. It flies over the sea. The pilot flicks a switch. A sonar device is lowered into the sea. The helicopter from below as the sonar is lowered. The sonar enters the sea while the helicopter hovers. The pilot and assistant. A switch is flicked. The sonar is hoisted and the helicopter moves on. The sonar is lowered into the sea elsewhere. The Wessex crew. The pilot. The Wessex drops a homing torpedo. A thermograph device trails alongside a ship as it is pulled in. Two sailors gather it on board. Closer. The device measures sea depth and temperature. An officer analyses its findings. A variable depth sonar is readied for launch into the sea. Similar. It is lowered into the sea. A depth charge is rolled into position. Similar. A mortar or gun battery on the ship's deck. Sonar operators in front of an old fashioned computer. The computer feed information to the mortar. The mortar again. The sonar room again. A control room. A trigger is pulled. The sonar operators.
The mortars fire. Their shots cause huge explosions some distance away from the ship. The mortars retract to unload. Gunners clear the mortars' spent shells. Depth charges or mortar round is loaded. The sonar operators and an officer. The mortars fire again. More explosions at sea. Mortars. Explosions. And more mortars. More explosions too. The periscope tower of a surfacing submarine, S101,. The impressive sight of the sub's bow as it breaks the waves. Profile of the sub which is a nuclear-powered fleet submarine. Its bow again. Waves. The periscope and tower as it dives. The captain downs periscope, inside. (Narrator explains that nuclear subs can outrun and manoeuvre surface ships. Two sonar operators. The periscope remains slightly above water. A mine sinks in the sea. Electric cables are uncoiled from a minesweeper, as seen earlier. A swimming navy clearance diver. A submarine hull, underwater. Three concentrating sonar operators. A control room on a ship. A ship's mortar's firing. A WASP helicopter taking off. A sonar device, hoisted by a Wessex helicopter. Sub S101 travelling on the surface, crew members on the tower. The sub's bow again. Waves alongside. Credits.


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