Sub S-4 battery room where several of the crew met instant death when salt water reached the batteries and made chlorine gas

Sub S-4 enters Navy Yard drydock. |
Tug Falcon raising the sub S-4 off Provincetown |
Conning Tower of the S-4 after being raised and brought to Navy Yard. |
Sub S-4 floated with pontoons, at Navy Yard |
Conning Tower with flag at half mast, sunken sub S-4 at Navy Yard |
Sub S-4 comes to surface off Provincetown after being on the bottom for 4 months in 102 ft. of water. |