National Park Service officials will discuss current and past underwater research projects that have been conducted on the sunken battleship USS Arizona at 6 p.m. Saturday at the USS Arizona Visitor Center at Pearl Harbor.

Seating in the 152-seat visitor center will be on a first-come, first-served basis.

Three-dimensional, high-definition video taken of the interior and exterior of the 180-foot battleship sunk during the Japanese attack on the Pacific Fleet on Dec. 7, 1941, will be shown and discussed. Also shown will be underwater video of the USS Utah.