
Placing runners in preparation for moving the submarine across Samoa Beach to Humboldt Bay, near Eureka, California. Taken on 2 April 1917 during salvage operations by the Mercer-Fraser Company.
Photographed by the Freeman Art Company, Eureka.
A lot more pix and info here:
http://www.history.navy.mil/photos/events/ev-1910s/ev-1917/h3-salv3.htm