English: Puget Sound (Oct. 26, 2006) - Lt. Cmdr. Paul Treadway, Industrial Hygiene Officer and Assistant Safety Officer of the Nimitz-class aircraft carrier USS Abraham Lincoln (CVN 72), uses a sound level meter to demonstrate the high decibel levels on Lincoln's flag bridge as spaces are being rehabilitated. Treadway and other ship and shipyard safety personnel conduct daily safety walkthroughs throughout the ship to ensure Sailors and workers are wearing proper personal protective equipment to protect against industrial hazards such as high noise levels. Lincoln is currently in dry dock at Puget Sound Naval Shipyard undergoing rehabilitation and maintenance as part of a Dry Dock Planned Incremental Availability period. U.S. Navy photo by Mass Communication Specialist Seaman James R. Evans (RELEASED)