 Unsuccessful attempt to raise the S-51 sub. Pontoons were later used |
 Ship and floating crane over sunken sub S-4 off Provincetown. 40 man crew died. |
 S-4 disaster: Giant crane 'Hercules' removing pontoons from USS wright |
 Sub S-4 tied up at Pier 7, to remove her batteries and engines |
 Navy crane 'Hercules' with boilers from the ill-fated sub S-4 |
 Boilers from the sub S-4 on Navy Yard crane 'Hercules' |