The Barge of the Dead was a mythological Klingon barge that ferried the dishonored souls of the dead to Gre'thor, captained by Kortar (also known as "Kotar"), the first Klingon. When Kortar became more powerful than the gods who created him, he destroyed them, and, as punishment, he was condemned to ferry the souls of the dishonored.
Star Trek Timeline [INTERACTIVE]
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"This is a Federation starship, not the Barge of the Dead."