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A
flotilla of nine K-class submarines, including K4, accompanied by a large
convoy of warships of various kinds sets sail from Rosyth naval base in the
late afternoon of 31st January 1918 for a night exercise 13 miles
off the Fife coast near May Island.
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The
vessels have been ordered to maintain radio silence and extinguish navigation
lights.
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It is now
dark and there is a light mist.
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K22, at
the head of the column, suddenly changes course in order to avoid a group of
minesweepers that cut across her path, not knowing of the fleet operation in
progress.
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K22's
rudder jams, sending it into K14 and killing two of K14's crew members.
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HMS
Inflexible then hits K22, sheering off the submarine's ballast tank and
bending her bows round 90 degrees.
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The
cruiser, HMS Fearless, strikes K17 and sinks the submarine in eight minutes.
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The crew
of K17 escapes but are mown down by a following destroyer. Nine crew
members survive, but 48 perish.
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K6 tries
to avoid K12 and ploughs into K4.
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K4 sinks
with her entire crew of 105 men.
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2
submarines are lost and 3 are damaged.
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Details
of the tragedy are kept secret by the Admiralty.