| Louis Alter | Kelly chief machinist mate | |
| Nathan Anderson | Ensign Yates second in command | |
| Gerard Arbous | Smith seaman at diving wheel bow | |
| Adele Ardsley | Iona Richley | |
| Bob Casey | Ensemble | |
| Joseph Costigan | Hackford torpedo man | |
| Frank Dale | Guilbert torpedo man | |
| Arthur Davis | Lieutenant Hardy commander of Submarine F. 7 | |
| William A. Evans | Barry seaman at helm | |
| James Grant | Waiter | |
| Frank L. Hall | Toomey torpedo man | |
| Thea Thompson | Miss Deal Beach | |
| Harry Wilcox | Ensemble |