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The trash had no intelligence value. But it was useful as a prank. The next day the trash went out with every item, including a few well-thumbed Playboys as a special gift, covered in a thick slime of Aqua Lube, a green grease used for lubricating pipe joints that is designed for use in deep-ocean environments. It is detergent- and solvent-resistant and is famous for its ability to ruin clothes and stay on skin for days, even after vigorous washing. To make sure the Soviets didn’t miss a single bag of slimy mail, the crew began to pump acetylene gas into the bags. This made them extra-buoyant, so much so that they’d skip across the waves when thrown overboard, often causing the SB-10 to change course and chase them.
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Josh Dean (The Taking of K-129: How the CIA Used Howard Hughes to Steal a Russian Sub in the Most Daring Covert Operation in History)