Thunder Afloat
John Thorson
'Rocky' Blake
Susan Thorson
District Commander
U-Boat Captain
'Cap' Finch
Milo
Ives
German U-Boat Officer
Admiral Ross
U-Boat Petty Officer
Ensign Dyer
Admiral Girard
Recruiting Officer (uncredited)
Fisherman (uncredited)
Listener (uncredited)
Radio Operator (uncredited)
Sailor (uncredited)
Lieutenant (uncredited)
Captain (uncredited)
Man with Finch (uncredited)
Mrs. Gill (uncredited)
Petty Officer (uncredited)
Lookout (uncredited)
Survivor (uncredited)
Surgeon (uncredited)
Wireless Operator (uncredited)
Boy (uncredited)
Signalman (uncredited)
Nurse (uncredited)
Orderly (uncredited)
Naval Aide (uncredited)
Old Sailor in Bilge Area (uncredited)
Wireless Operator Sending Coded Message (uncredited)
Engineer (uncredited)
German Operator (uncredited)
German Sailor Looking for Wireless (uncredited)
Cook on Tugboat (uncredited)
German Sailor (uncredited)
Shore Patrol Sailor (uncredited)
Young German Sailor (uncredited)
Junior Officer Standing by Map (uncredited)
German Officer (uncredited)
