The radio room. Note the speaking tube, adapted to make it more convenient for the radio man. In most radio room photos, the tube ends to the left of the radio man's head. This is the speaking tube to the pilot house.
Photograph of the radio room on a chaser. From the collection of George Perley Morse, CO of submarine chaser SC 227. Thanks to E. M. Atwood for submitting the collection to The Subchaser Archives.