On the night before he sails in search of the steamship Arcadia's sunken gold, Paul Sinclair (Bruce Bennett)meets Madeliene Nielson (Anita Louise) in a San Francisco nightclub. On the second day at sea, Madeliene turns up as a stowaway. While diving and searching for the sunken gold, off the Phillipines, Paul discovers that a foreign-country submarine has been laying mines in order to completely cut off the Phillipines from American protection.
| Actor | Role |
|---|---|
 Anita LouiseMadeleine Neilson | Madeleine Neilson |
 Bruce BennettPaul Sinclair | Paul Sinclair |
 Oscar O'SheaCaptain Velsar | Captain Velsar |
 Pedro de CordobaHenri Jerome | Henri Jerome |
 John TyrrellDreaux | Dreaux |
 Victor WongWillie Ming | Willie Ming |
 Harry StrangChief Engineer | Chief Engineer |
 Don BeddoeBartlett | Bartlett |
| CCharles McMurphy2nd Mate | 2nd Mate |