In 2008, the eruption of Mount Okmok generated a volcanic mudflow that covered a 70-acre portion of the Fort Glenn Formerly Used Defense Site on Umnak Island in Alaska. A field crew for the U.S. Army Corps of Engineers found that this lahar layer varied in depth from a few inches to as much as 4 feet in some areas during the process of removing unexploded ordnance from the site in 2020 and 2021. This issue required the team to excavate wider and deeper to ensure all munitions were safely recovered from the soil. (U.S. Army Photo)