You'd think they could at least send a ship. It's bad enough to be court-martialed and spending the rest of our lives mining chloride, but to have to go home in this Klingon flea trap...

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McCoy to Kirk telling him that at least if a ship could be sent, considering that being court-martialed is bad enough. He points out that they may spend the rest of their lives mining chloride. He further remarks disdainfully about having to go home in this Klingon flea trap, meaning the ship they are on.

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