7 Submarine Hull Section Image: NARA & DVIDS Public Domain Archive Public Domain Search}

A man works to install a submarine emergency communication transmitter (SEC) buoy Mark 9 Mod O outside the pressure hull and inside the other hull of a simulated submarine hull section during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT will be released and act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O is secured aboard a simulated submarine hull section during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released and act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O is loaded aboard a simulated submarine hull section during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released and act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O is loaded aboard a simulated submarine hull section during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released and act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A simulated submarine hull section is secured following the loading of a submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released an act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A simulated submarine hull section is secured following the loading of a submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released an act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More

A worker places a chock aboard a simulated submarine hull section prior to the loading of a submarine emergency communication transmitter (SECT) buoy Mark 9 Mod O during testing at the Naval Ordnance Laboratory. When put into fleet use the SECT, which will ride outside the submarine's pressure hull and inside the submarine's outer hull, will be released and act as a surface marker if and when the ship is sunk

The original finding aid described this photograph as: Base: White Oak State: Maryland (MD) Country: United States Of America (USA) Scene Camera Operator: Unknown Release Status: Released to Public Combine More