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I should have died many times, Captain, but I continue to survive somehow. This time it was your fault.
— Von Stolberg · The Enemy Below

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker says survival has repeatedly defied expectation, then credits the captain by calling it his fault. The final word turns what could be thanks into a wry accusation. The humour depends on treating continued life as something another person can mischievously be blamed for.
Context reviewed