S-40 on operating with two other S-boats while with the Asiatic Fleet off the China coast, approximately 1925. The submarine isn't diving; rough seas have caused the bow to plunge into the swells. The exhaust from the diesel engines can be seen on the superstructure just forward of the "40".
Photo in the private collection of Ric Hedman.
A closeup of the photo above, showing one of the other two S-boats accompanying the S-40. It is another 30 series boat.
Photo in the private collection of Ric Hedman.
S-40 see approaching a tender, likely the Canopus (AS-9), to moor. The location is somewhere on the China Station, approximately 1925. The radio mast of another S-boat alongside the Canopus can be seen in the foreground.
Photo in the private collection of Ric Hedman.
A photograph and a series of closeups taken while S-40 was mooring into a nest alongside a tender on the China Station, approximately 1925. Note the navigation light details on the fully raised radio masts. The large round structure on the aft end of the conning tower fairwater is a combination ventilation pipe and radio cable pass-through that lets into the control room and serves the aft end of the boat, mostly for ventilation of the aft battery during charging. The main induction for the engines is located in the area between the periscopes. Submarine crews did not like conducting a mooring operation in their dress white uniforms, as it was very easy to get dirty while handling lines and it was difficult to get the whites clean again.
