World War II Mediterranean Submarine Warfare Context

• British Navy fighting Italian Navy for Mediterranean control
• Crystal-clear waters = death trap for submarines both sides
• Submarines bombed from air, attacked by ships with depth charges, hit mines
• 2 out of 5 British submarines entering Mediterranean sank during war
• British Navy lost 79 submarines total, only 4 successful escapes (5% survival rate)

HMS Perseus Mission and Disaster

• Submarine assigned to Alexandria, British Egypt
• Main objective: covertly transport supplies to besieged Malta (strategic British outpost)
• November 26, 1941: left Malta for Alexandria with supply mission
• Side mission: patrol southern Aegean waters around Greek islands
• December 6, 1941, 10:00 PM: struck Italian mine off Kefalonia island coast
• 61 men aboard: 59 crew members, 2 passengers (including John Capes)

The Sinking and Initial Survival

• Capes sleeping in empty torpedo tube, awakened by explosion
• Thrown across compartment, all lights out
• Sub twisted, plunged, smashed down 170 feet beneath sea level
• Capes found flashlight, navigated through darkness and rising water
• Passed mangled corpses of dozen dead crew members
• Reached engine room, found 3 other survivors
• Room beyond completely flooded, blocking further movement

Escape Attempt Planning

• Moved to escape chamber and hatch above engine room
• Found escape suits tested only for 100 feet maximum depth
• Suits had oxygen for 100 feet distance only
• Broken gauges reading 270 feet depth (actual depth: 171 feet)
• Would need to swim final 71 feet without oxygen
• Believed they'd swim 171 feet without oxygen (world record attempt)
• Time and oxygen running out, no other choice

The Escape Sequence

• Capes took final swig from rum bottle
• Flooded escape compartment with great difficulty
• Released damaged bolts on escape hatch
• Pushed 3 other men out first, then followed
• Risk of "the bends" from rapid pressure change
• Gases bubble up in body causing pain, paralysis, potential death
• Choice: risk bends or guaranteed drowning

Surface Survival and Rescue

• Capes surfaced alone on cold December night
• Severely suffering from the bends, enormous lung pain
• Other 3 men never reached surface
• Spotted white cliffs of Kefalonia island 5 miles away
• Swam 5 miles to shore
• Found unconscious on beach by Greek fishermen next morning

18-Month Underground Survival

• Island occupied by Italian army
• Forced to hide underground in rescuers' home
• Passed house to house for 18 months evading Italian capture
• Lost 70 pounds weight during hiding period
• Dyed hair black to blend with locals
• May 1943: Royal Navy organized rescue operation
• Smuggled away on fishing boat to Smyrna, neutral Turkey
• Finally reached Alexandria 18 months late

Post-War Skepticism and Recognition

• Awarded British Empire Medal for heroism
• Most people doubted survival story truth
• Capes' name not on Perseus crew list from Malta departure
• Submarine commanders ordered to bolt escape hatches shut (prevent depth charge damage)
• No witnesses to back up story
• Reputation as great storyteller, account changed over decades
• 270-foot escape claim made story harder to accept
• Widely considered liar and imposter by death in 1985

1997 Wreck Discovery and Vindication

• 12 years after Capes' death, HMS Perseus wreck discovered 1997
• Found off Catalonia coast at Mediterranean bottom
• Series of dives revealed:
  • Empty torpedo tube where Capes bunked
  • Escape hatch compartment opened exactly as described
  • Rum bottle he claimed to drink from
  • Depth confirmed 171 feet
  • Gauges reading 270 feet were indeed broken
• Wreck found exactly as John Capes described
• Forever vindicated him as submarine's sole survivor
• Tragic he didn't live to receive deserved recognition