The Ship - Roeder-Johnson
The entire assembly shown could be lowered into the water via the red cable around the giant, gray pulley at the top of the picture. The transceiver had 8 antenna arrays in the black cylinders, and operated at Very Low Frequencies of below 25 KHz.

The entire assembly shown could be lowered into the water via the red cable around the giant, gray pulley at the top of the picture. The transceiver had 8 antenna arrays in the black cylinders, and operated at Very Low Frequencies of below 25 KHz.