Question: How many ardent Nazis where in the crew?
About the article "Das Boot", section "Historical accuracy".

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Ardent Studios is a recording studio located in Memphis, Tennessee.
Ardent Records/Ardent Music is the in-house label. 
An ardent gravitates toward a set of philosophical concepts suitable to their heritage, upbringing, and life experiences.
Many mistake an ardent for a cleric or paladin, because they are often as enthusiastic about their personal philosophies as any divine missionary could be.
Unlike divine spellcasters who gain their power through a deity, an ardent directly taps the concepts the deity represents, bypassing any connection to a conscious higher power.
An ardent's pursuit of these cosmic philosophies gives them access to psionic power in a unique way: through psionic mantles.
Each mantle is tied to one of the universal true concepts that an ardent so admires, and is represented by a specific list of psionic powers and abilities.
An ardent gains access to new mantles as they gain levels, representing his growing awareness of the interconnected nature of core truths and a growing understanding of how the multiverse works.
All ardents focus on two mantles, known as their primary mantles.
These concepts are those that an ardent finds most appealing or that possess the most potential power in their eyes.
Ardents consider all other mantles as secondary mantles - philosophies certainly powerful and worthy of study, but not considered as central to the universe as the character's primary philosophies. 
HMS "Ardent" was a Royal Navy Type 21 frigate.
Built by Yarrow Shipbuilders Ltd, Glasgow, Scotland.
She was completed with Exocet launchers in 'B' position.
"Ardent" took part in the Falklands War, where she was sunk by Argentine aircraft in the Falkland Sound on 22 May 1982. 
In the Norwegian Sea, chaos erupts on board the USS "Ardent", an American destroyer escort.
Due to mysterious yet unspecified events, half of the "Ardent"'s crew board lifeboats and abandon ship.
Eighteen hours later, they are spotted by a Canadian fishing vessel; however, in that short span of time, the young crew members have undergone rapid aging.
Dana Scully (Gillian Anderson) and Fox Mulder (David Duchovny) visit the ship's sole surviving crew member, Lt. Harper, who has been quarantined at the Bethesda Naval Hospital.
Scully finds that Harper, despite being in his twenties, has aged to the point of being unrecognizable.
Mulder explains that the "Ardent" vanished at the 65th parallel, a location with a history of ship disappearances.
Mulder believes that a "wrinkle in time" exists there, and that the "Ardent" was the subject of government experimentation related to the Philadelphia Experiment from World War II.
In Norway, Mulder and Scully get Henry Trondheim (John Savage), a naval trawler captain, to take them to the "Ardent"'s last known location.
After crashing into the bow of the "Ardent", Mulder, Scully, and Trondheim find signs of advanced corrosion, even though the "Ardent" is only a few years old.
Below decks, the party finds the mummified remains of several crew members.
They also find the wizened commanding officer of the "Ardent", Captain Barclay, who claims that "time got lost" after his ship encountered a "glowing light" in the ocean.
Trondheim's boat is stolen and his first mate is murdered.
Trondheim is later attacked by a Norwegian pirate whaler named Olafsson, who has not aged despite being on the ship for the past two days.
Mulder, Scully, and Trondheim eventually begin to age unnaturally.
Scully develops a theory that the "Ardent" is sailing near a metallic object beneath the ocean, and that it has caused free radicals to rapidly oxidize their bodies and age them.
When Mulder notices that the ship's sewage pipe is the only one not corroded through, the agents realize that something from the ocean contaminated the "Ardent"'s potable water and led to the aging; Olafsson's men remained unaffected due to their consumption of recycled water from the sewage system.
Desperate to survive, Trondheim kills Olafsson and sets out to keep the water for himself.
Scully learns from blood tests that the contaminated water causes rapid cellular damage and dramatically increases sodium chloride in the body.
She tries to ration the drinkable water amongst the three, but discovers Trondheim attempting to hoard what little that remains.
Trondheim locks Scully out of the sewage hold, forcing her to use minuscule supplies to keep Mulder alive.
The corrosion eventually eats through the ship's hull, flooding the hold and drowning Trondheim.
The agents both lose consciousness shortly before Navy rescuers arrive on the "Ardent".
Scully comes to at the hospital, where she is told that her written observations on the case helped naval doctors reverse their aging and save Mulder from near-certain death.
Scully says that she wants to return to the "Ardent" for more research, but the doctor tells her that the ship sank shortly after their rescue. 
The "Ardent" was first commissioned in October 1774 under Captain Sir George Douglas.
In 1778, under the command of Captain George Keppel, she was with Admiral Lord Howe's squadron off New York, defending the town from the larger French fleet under the command of Admiral d'Estaing.
The two forces engaged in an action off Rhode Island on 11 August, though both fleets were scattered by a storm over the following two days.
She returned home to Portsmouth and was paid off in January 1779.
June 1779 saw "Ardent" recommissioned under the command of Captain Phillip Boteler, sailing from Plymouth in August to join Sir Charles Hardy in the Channel.
According to the ship's logs, as many as 4/5 of the crew were landmen, and neither Boteler nor the captain of the "Marlborough", in whose company "Ardent" was sailing, were aware that a French fleet had put to sea.
"Ardent" encountered a fleet two days after sailing, and after receiving the correct replies to the private signal, ran down to meet them.
The fleet however was a Franco-Spanish fleet, somehow in possession of the Royal Navy signal code book, thus permitting the correct response to "Ardent's" signals.
With "Ardent" within range, the French frigate "Junon" fired two broadsides before raising her colours.
Three further frigates, and the Spanish ship of the line "Princesa" joined the action shortly afterward.
In response, "Ardent" offered sporadic and inaccurate return fire before striking her colours to the vastly superior enemy force.
At his subsequent court martial Captain Boteler blamed his failure to return fire on an inadequate supply of gunpowder for "Ardent′"s cannons, a statement strongly denied by the ship's gunner Archibald Macintyre who presented evidence there was enough powder for fifty minutes of vigorous engagement.
The court martial rejected Boteler's claims, finding instead that the inexperience of the crew was the principal cause of "Ardent′"s failure to respond to the attack.
Boteler was dismissed from the Navy for his failure to adequately defend his ship.
Little is known of "Ardent's" career in the French Navy; however the British re-captured her on 14 April 1782 following the Battle of the Saintes, and recommissioned her that month under Captain Richard Lucas.
On 28 August 1783 the ship was renamed "Tiger".
She was sold out of the service in June 1784.