Question: When was the first BBC mini-series based on Das Boot?
About the article "Das Boot", section "List".

Candidate passages:
 150 minutes (1981, 1982) Theatrical
 209 minutes (1981) unreleased
 300 minutes (1984, 1988) BBC mini-series
 208 minutes (1997) Director's Cut
 293 minutes (2004) "Das Boot: The Original Uncut Version"
More to add  BBC mini-series.  
Several versions of the film and video releases have been made: The first version to be released was the theatrical 150-minute (2½-hour) cut, released to theatres in Germany in 1981, and in the United States in 1982.
It was nominated for six Academy Awards (Cinematography, Directing, Film Editing, Sound (Milan Bor, Trevor Pyke and Mike Le Mare), Sound Effects Editing, and Writing).
The film was partly financed by the German television broadcasters WDR and the SDR, and much more footage had been shot for the film than was shown in the theatrical version.
A version of three 100-minute episodes was transmitted on BBC Two in the United Kingdom in October 1984, and in Germany and Austria the following year.
In 1988 a version comprising six 50-minute episodes was screened.
These episodes had additional cutback scenes summarising past episodes.
Petersen then oversaw the editing of six hours of film, from which was distilled "Das Boot: The Director's Cut", 209 minutes long (3 hours, 29 minutes).
Released in 1997, this cut combines the action sequences seen in the feature-length version with character development scenes contained in the mini-series.
This release also provides better sound and video quality.
Petersen originally had planned to release this version in 1981, which for commercial reasons was not possible.
The Director's Cut was released to cinemas in Germany on 11 December and on 4 April 1997 in the U.S.
In addition to the "Director's Cut" DVD, a Superbit version, with fewer additional DVD features but a higher bit-rate (superior quality), was released by Columbia Pictures.
An uncut miniseries version, running 293 minutes (four hours, 53 minutes), was released to DVD on 1 June 2004, as "Das Boot: The Original Uncut Version" with enhanced video and audio quality.
It omits the cutback scenes of the 1988 television broadcast and is therefore shorter.
On 14 October 2010, the 208-minute "Director's Cut" was released on a German-language Blu-ray Disc in Europe.
It was released in the United States on 5 July 2011.
The shortest version begins an evening in a French nightclub.
The longer begins in a car that is driving to the same place, and several drunken sailors are pissing at the car, in which the U-boat commander and the guest reporter are sitting.
The commander doesn't care, but later the new German-Mexican volunteer officer makes complaints about it.
This complaint is also cut in the short version, hence the introduction of this officer becomes very short.
The long version was released for at least cinemas in Sweden at the time.
(Long time before 1997.)
Biography.1991–1992: "Das Boot".
The name of the project comes from the film "Das Boot" about the German submarine "U-96" from the Second World War.
The project's first hit, "Das Boot" (1991), is a techno adaptation of the film's title melody, which had been originally composed by Klaus Doldinger.
An album of the same name was also released. 
  "Das Boot", a 1981 German movie by Wolfgang Petersen based on the Lothar-Günther Buchheim novel of the same name  "Boots" (film), a 1919 American silent film starring Dorothy Gish and Richard Barthelmess - see list of films shot in Riverside, California  "Boots", a poem by Rudyard Kipling  Bootleg recording, unauthorized audio or video recording, often abbreviated to "boot"  "Boots", an episode of the television series "Teletubbies"