Members of the Washington Homeland Security Roundtable practice immersion suit survival techniques in the Willamette River at the docks of Marine Safety Unit Portland, Ore., July 16, 2018.
Experts recommend that groups of survivors interlock arms to keep from getting separated and face their legs outward to create a large-star pattern that can be seen more easily by search and rescue members.
U.S. Coast guard photo by Petty Officer 3rd Class Trevor Lilburn.