 Inside the lighthouse, blue lines are painted on the wall to mark historic storm surges above 'mean sea level' (msl).Hurricanes of 1855 and 1906 reached 14.0 feet above msl, a 1909 hurricane crested at 15.0 feet msl, and Hurricane Camille's record of 17.5 feet was broken by Hurricane Katrina, which crested at 21.5 feet msl.The Biloxi Lighthouse is a beacon of welcome, caution, and hope to the Mississippi Sound.