This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Uboot netz . en Image of figure Diagrams showing action of pram indicator buoy with hydrostatic release Publication No NOTES ON ANTISUBMARINE DEFENSES NAVY DEPARTMENT OFFICE OF NAVAL INTELLIGENCE PDUSGovMilitaryNavy Antisubmarine nets
Page 2023 Free-images.com. All images are Public Domain