Wet-for-dry is a term in the film industry for a special effect wherein an actor or prop is filmed in a water-filled tank, then imposed onto the film most often via ChromaKey or similar technology. The purpose of this is either to facilitate SlowMotion or to create the image of a supernatural creature not entirely bound by gravity. Filming in water works most effectively on hair and other long, flexible appendages, so expect this effect to take full advantage of such.

The opposite of wet-for-dry is dry-for-wet, where a subject filmed on a stage is imposed onto a water backdrop to avoid having to film underwater, thus making it possible for actors to do a scene while also being able to, for instance, breathe.


!!!Examples of Wet-For-Dry

* The dance of the Delphi in ''[[Film/ThreeHundred 300]]''.
* The Dementors in the ''Film/HarryPotter'' films. Also, in the Half-Blood Prince film, actress Creator/GeorginaLeonidas (who played curse-victim Katie Bell) was filmed wet-for-dry for the scene in which she is suspended in the air, so that her hair would look like it was flaring around her head.
* The Ghost of Christmas Past in ''Film/TheMuppetChristmasCarol''.
* Wet-for-dry was used in the MusicVideo for Music/{{Portishead}}'s "Only You".
* The spirits that come out of the Ark in ''Film/RaidersOfTheLostArk'' were filmed in a tank to get a ghostly flowing effect on their hair and clothes.
* The ''Series/DoctorWho'' episode "The Satan Pit" had a Wet-For-Dry as one of the characters floated dead in space. Also - Amy hanging out of the TARDIS with her hair billowing in "The Beast Below".
* Clouds (by means of dye solutions) were frequently done this way before CGI, though in a sense it's all still wet.

!!!Examples of Dry-For-Wet

* One of the oldest examples is ''Film/TwentyThousandLeaguesUnderTheSea''. There are scenes with actual divers, yes, but other scenes requiring Creator/JamesMason and Paul Lukas to be seen through the helmets were accomplished this way.
* Sam's near-drowning scene at the end of ''[[Film/TheLordOfTheRings The Fellowship of the Ring]]''. Also, the drowned ghosts in ''The Two Towers'', those which weren't CGI.
* Nearly all the underwater scenes in the film version of ''Film/TheHuntForRedOctober'' were actually done with models in a tank filled with air and smoke, because the smoke created the "just murky enough" effect the director wanted.
** Same thing was done in ''Film/TheAbyss''.
* [[{{Supermarionation}} Gerry Anderson]] shows beginning with ''Series/{{Stingray 1964}}'' used dry-for-wet underwater scenes, in which model submarines or marionette divers would be filmed through a narrow water tank containing bubble machines and fish.
* ''Film/ForYourEyesOnly'': Many of the underwater scenes (including the close-ups between Film/JamesBond and Melina) were filmed on a dry sound stage and had lighting effects, slow-motion photography, wind, and bubbles added in post-production. Actress Carole Bouquet (Melina) had a preexisting health condition that prevented her from filming underwater.
* The underwater scene in ''Film/TheSpirit'' was filmed dry.
* The scene in ''Film/LaraCroftTombRaiderTheCradleOfLife'' in which Lara and her two companions travel down to the underwater Luna temple on motorised sleds was shot dry-for-wet on a smoked-up soundstage.
* Exterior shots of the underwater Aquatica facility in ''Film/DeepBlueSea'' were shot on a smoked-up soundstage, which bubbles added digitally.
* The Classic "Doctor Who" story "The Underwater Menace" used this for the sequences involving the fish-people, [[SpecialEffectFailure not entirely convincingly]].
* A rare theme park example: [[Ride/DisneyThemeParks Tokyo Disney Sea]]'s 20,000 Leagues Under the Sea ride achieves the illusion of traveling underwater by use of a suspended ride system through dry sets and vehicles featuring two-paned windows that contain water that bubbles as the sub pods "dive".