Navy Petty Officer 3rd Class Ryan Doherty, foreground, conducts an underwater pier survey using ultrasonic testing tools with divers assigned to Underwater Construction Team 2 in Apra Harbor, Guam, Dec. 14, 2017. Doherty is a diver assigned to Mobile Diving Salvage Unit 1. Navy photo by Petty Officer 1st Class Arthurgwain L. Marquez