A suggested addition to the cleats, helmets, and shoulder pads packed by NFL teams on any trip to Seattle?

Ear plugs.

It's long been no secret that the Seattle Seahawks' CenturyLink Field boasts some of the loudest crowds not only in American football but in all of sports. Now, though, members of the stadium's "12th Man" can claim not just being some of the most boisterous fans on Earth - officially, they are the loudest fans on the planet.

With a peak reading of 136.6 dbA during a 29-3 victory over their division rival San Francisco 49ers on Sept. 15, Seahawks fans broke the record for loudest crowd roar at a sports stadium. The previous mark stood for more than two years at a reading of 131.76 dbA by fans of Turkish soccer team Galatasary.

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"Guinness World Records run the gamut of volume from near silence at individual records to nights like tonight," said on-site GWR adjudicator Philip Robertson. "In my experience, I've seen and heard large crowds make a difference to events but to hear a sold-out CenturyLink Field roar almost as loud as a jet engine was something to behold."

Organized by former Seahawks player Joe Tafoya and his fan group Volume 12, those at the game actually broke the record twice. The first time came during a first-quarter sack of opposing quarterback Colin Kaepernick, registering a 131.9 dbA reading. The real thunder, though, came in the third quarter. That's when a Seahawks goal line stand sent the crowd into its final record-breaking frenzy.

Known as the "12th Man" for their vocal support of the 11 players on the field, Seattle's fans can now add the official Guinness World Records distinction to a reputation that has only grown exponentially since the opening of CenturyLink Field 11 years ago.

The Seahawks have now won nine straight home games, including a perfect 8-0 season in 2012. Even a one-hour storm delay during the game couldn't stop their fans from history.

"Seahawks fans, the '12th Man,' were so much louder than any other sporting event I've attended anywhere in the world," Robertson said, "that I couldn't hear the actual thunder overhead."