Seattle-based Holland America Line is flying a 12th Man Flag off its mast in the Caribbean this week, according to social media postings from the cruise line.

The 12th Man Flag honors the fanbase of the NFL's Seattle Seahawks - which gets so loud it can have the effect of a 12th player on the field.

The Seahawks won the NFC title game over the weekend, advancing to the Super Bowl, scheduled to be played in New Jersey on Feb. 2.