I don't know if it's related but the Swedes have some of the quietest submarines in the world:
In 2005, the USS Ronald Reagan met its match in the form of a single, diesel-powered Swedish submarine. During war games, the plucky submarine was able to sneak through the passive sonar defenses ...
And the headline story from IFL Science:
It's perfectly feasible that in the 1980s a major diplomatic incident between nuclear superpowers could have been triggered by fish farts. In fact, Russia and Sweden nearly came to blows over this very thing. They just didn't know it at the time.
Before we move on to farts, first, some background. In 1981, a Soviet submarine ran aground on the south coast of Sweden, just 10 kilometers (6.2 miles) from a Swedish naval base. The Soviets claimed that they were forced into Swedish territory by severe distress, and later navigation errors, while Sweden saw it as proof that the then Soviet Union was infiltrating Swedish waters. It didn't help that when Swedish officials secretly measured for radioactive materials using gamma-ray spectroscopy, they detected what they were 90 percent sure was uranium-23 (used for cladding in nuclear weapons) inside the sub, indicating that it may be nuclear armed.
The submarine was returned to international waters, but the Swedish government remained alert, convinced that Russian subs could still be operating near their territory. Which is when they started to pick up elusive underwater signals and sounds. In 1982, several of Sweden's subs, boats, and helicopters pursued one of these unidentified sources for a whole month, only to come up empty-handed.
This continued for over a decade. Every time they picked up an acoustic signal they would search and find nothing but for a few bubbles on the sea's surface. Sweden was, of course, worried about the intrusions, and couldn't think why, with the Cold War now over, Russia would continue to provoke them in this manner.
But it was farts....
.....MUCH MORE
One of the scientists who broke the case, Magnus Wahlberg, was awarded the igNobel Prize in Biology by Harvard's Journal of Improbable Research (shared with a team from Scotland who independently came to similar conclusions as to what the Herring were up to.)
https://www.improbable.com/about/people/MagnusWahlberg.html
The 2004 vintage awards were very well rounded with the prize in Medicine going to an American team for:
