chunk: It turns out that Sherlock's brother Mycroft (Christopher Lee) is involved in building a pre-World War I submarine for the British Navy, with the assistance of Monsieur Valladon. When taken out for testing, it was disguised as a sea monster. The midgets were recruited as crewmen because they took up less space and needed less air. When they meet, Mycroft informs Sherlock that his client is actually a top German spy, Ilse von Hoffmanstal, sent to steal the submersible. The "monks" are German sailors.
  Queen Victoria (Mollie Maureen) arrives for an inspection of the new weapon, but objects to its unsportsmanlike nature. She orders the exasperated Mycroft to destroy it, so he conveniently leaves it unguarded for the monks to take (rigging it to sink when it is submerged). FrĂ¤ulein von Hoffmanstal is arrested, to be exchanged for her British counterpart.