[[caption-width-right:300:Calling T for Troper!]]

->'''Official''': ''You say you need a Wellington Bomber for test drops. They're worth their weight in gold. Do you really think the authorities will lend you one? What possible argument could I put forward to get you a Wellington?''
->'''Barnes Wallis''': ''Well, if you told them I designed it, do you think that might help?''

''The Dam Busters'' is a 1955 British film starring Richard Todd and Creator/MichaelRedgrave. The story of the Dam Busters is one which brings out several features of the British -- the sophistication of their engineering innovation, the bravery of their armed forces, the incompetence of their leaders and their unerring ability to be first in a technical field and then leave it to others to make money out of it (for example, see Babbage and Turing...or Whittle...)

At the beginning of WW2, the great engineer (then not yet Sir) Barnes Wallis (played by [[Creator/MichaelRedgrave Redgrave]]) pointed out that bombs rarely did much damage to hardened military installations unless they hit them right on the button (and often not much even then). What you needed was a way of transmitting ALL of the bomb's energy into the target rather than spending most of it on the air. Barnes Wallis proposed that bombs should be designed so that they penetrated the ground AROUND the target rather than hitting it directly, and then went off UNDER it, causing a local earthquake and hole, into which the target would fall. The idea was brilliant and would have worked perfectly, but his initial proposal called for a bomb so large that no aircraft then in existence could carry it and the six-engined "Victory" bomber Wallis designed to do the job would have been little use for anything else and hideously expensive besides, so the Air Ministry were less than enthusiastic.

Finally, when he was allowed to work for the war effort, a targeting committee took him at his word when he said that dams were a good example of a target, and suggested that he take out the main Ruhr dams, at night, when precision bombing would be out of the question, and when the Germans were defending against torpedoes with a series of nets.

Barnes Wallis came up with the idea of making a 5-ton spinning bomb which would skip across the water, hit the dam wall, then sink to the bottom before exploding. Thus the water itself would focus the force of the blast against the dam's wall, in much the same way that a good torpedo hit causes more damage to a ship's hull than would an equivalent amount of explosives in a bomb or artillery shell. These were duly made in a tearing hurry and delivered by a crack team flying Lancasters in pitch darkness 60ft over water, nearly half of whom did not come back. The bombs worked, though the most important dam survived and the impact on the German war effort from destroying the others was somewhat underwhelming.

Having suffered almost 50% losses for disappointing results, the British mothballed the bouncing-bomb concept and never attacked the dams again, letting the Germans rebuild them. Barnes Wallis was allowed to develop his 'earth penetrator' bombs which were staggeringly effective -- taking out bridges and viaducts, sinking the ''Tirpitz'', stopping the V2 and V3 developments, destroying U-boat pens at Brest with 33ft reinforced concrete roofs and in one attack, and blowing up a railway line which ran under a mountain by dropping the bomb THROUGH the mountain and into the tunnel beneath.

Such a weapon would be of inestimable value for precision attack against individual targets of the kind we have had in the many small wars since 1945. So it figures that the British establishment promptly forgot about all the oily rag theory that Barnes Wallis had worked so carefully on, and just kept making airburst bombs which remain inefficient. The British people, on the other hand, remember the astonishing sight of 5-ton bombs bouncing along the surface of a reservoir, and think to this day that that was the whole purpose of the mission.

617 Squadron, the RAF unit tasked with all this, still exists and flies Tornadoes today.

Paul Brickhill wrote a novelised history of 617 Squadron's WWII action, called ''The Dambusters'', they made a movie about it, released in 1954. A remake is planned for [[strike:2010]] [[DevelopmentHell 2011 or maybe 2012]].

Notable for its influence on a little movie called ''[[Film/ANewHope StarWars]]'': the trench run was heavily inspired by the climax of the film. Several lines of dialogue are actually re-used, nearly verbatim.

!!'''The movie is a classic and contains examples of:'''
* {{Adorkable}}: Barnes Wallis, whose nerdiness is nicely offset by his childlike earnestness and inability to hide how queasy he becomes in tense moments.
* AirstrikeImpossible: One of the classic examples. The climax of the movie involves a series of low-altitude bombing runs, with the bombers flying in the face of heavy anti-aircraft defenses.
* ArtisticLicenseHistory: Partially justified as it wasn't until many years after the film that many of the facts were declassified. Planning to hit the dams had actually started in 1936, when war was inevitable. The '2 search light' technique was invented by a long forgotten civil servant who was working on the height problem.
* AwesomeButImpractical: The weapon itself, though the film downplays this. It was a very effective piece of technology but almost suicidally dangerous to deploy, requiring a heavy bomber to fly in a perfectly straight line at treetop height, a painfully easy target for AntiAir or passing fighters. Neither were the British able to devise a casing strong enough to withstand a ground impact yet light enough to be carried by the Lancaster, and the bombs had a nasty habit of rebounding unpredictably when used over even mildly choppy water, so they were only really useful for this one specific job.
* [[BarBrawl Mess Room Brawl]]: While waiting for conditions to be perfect for the raid, 617 Sqdn members got teased a lot by the members of other squadrons at RAF Scampton. After Gibson allows them to let off steam, one of these occurs.
* TheBigBoard: A few of them.
* BigDamPlot
* CaptainObvious: One of Gibson's crew: "This is bloody dangerous!"
* CasualDangerDialog: "Power lines." The film has them climb over them; in reality, some crews flew ''under'' them.
* CrazyEnoughToWork: The book makes it quite clear: This only worked because ''nobody had ever tried anything like this before'', so none of the generally simple and easy to build defenses that would have made it completely impossible were in place.
* DeadpanSnarker: One of the planes clips a tree, ending up with foliage in its undercarriage. "You don't suppose we should take it back?"
* [[spoiler: DownerEnding]]
* MadScientist: Barnes Wallis, whilst not actually mad (even though some of his inventions were seen that way), was certainly as prolific as the archetype -- he invented geodetic frames for aircraft, designed airships and aeroplanes, the bouncing and earthquake bombs, and after the war worked on swing-wing and supersonic aircraft, rocket-propelled torpedos, and even came up with designs for cargo submarines that were faster and more efficient than comparable surface ships.
* MyGodWhatHaveIDone: Barnes is visibly shaken, in a very StiffUpperLip fashion, when he hears how many men were lost during the raid... although ''not'' the German civilians who perished when the dams burst. [[DeliberateValuesDissonance It was that sort of war]], and numerous British civilians were undoubtedly dying to German bombs that same night.
--> '''Wallis''': ''[voice unsteady]'' Fifty-six men. If I'd known it was going to be like this I'd never have started.
* ObstructiveBureaucrat: Wallis encounters a few in the film's first act.
--> '''Civil Servant:''' You say you need a Wellington Bomber for test drops. They're worth their weight in gold. Do you really think the authorities will lend you one? What possible argument could I put forward to get you a Wellington?
-->'''Barnes Wallis:''' Well, if you told them I designed it, do you think that might help?
** [[StrawmanHasAPoint To be scrupulously fair to said civil servant]], [[JustifiedTrope the RAF didn't have many bombers to spare at that stage in the war.]]
* PoliticallyCorrectHistory: The name of Gibson's black Lab is well... [[NWordPrivileges not exactly PC]] and in 1999, the movie was shown in TV with "Trigger" dubbed over. It's intact on the DVD.
** The original scene is in ''Music/TheWall'' when Pink is freaking out in his hotel room.
*** Roger Waters remarks on the censorship in the DVD commentary for ''The Wall'', because "Trigger" was the name of Roy Rogers' horse.
** Referenced in ''[[Series/TheOfficeUK The Office]]'' (UK).
--->'''David Brent:''' Well don't ''keep'' saying it!
** The difference is between the British and US releases. In the UK at the time of the events, that wasn't an unacceptable word. By the time the film was made, it was an unacceptable word in the US. (Not necessarily for the obvious reason today. It would have counted as a very vulgar swear word.)
* StiffUpperLip: Taken as read - it is a British war film after all. Particularly notable in the climactic attack scenes though, particularly with Wallis' subversion of it, being easily the most tense and the most euphoric.
** One of the more heartbreaking examples, in the final line of the movie. Wallis and Gibson discuss the deaths of the crews in the night's mission (see MyGodWhatHaveIDone above), and as they part ways Wallis asks Gibson if he's going to go and get some sleep. His answer? "No. I... I have to write some letters first". That little crack in his voice is about the only indication you have of his grief over the death of 56 of his men.
*** The letters he has to write, of course, are to the wives and parents of those men telling them of the death of their loved ones. He didn't [b]have[/b] to do it, especially not right at that moment, the War Office would inform them by telegram - but he wanted to ensure that the families got something more personal as soon as possible.
* StrollingThroughTheChaos: Gibson during the aforementioned riot. Avoids a chair, a pair of pants and several airmen (though he does stop to deck a man who's double-teaming one of his own men).