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)

Fisherman (uncredited)

Recruiting Officer (uncredited)

Fisherman (uncredited)

Listener (uncredited)

Radio Operator (uncredited)

Sailor (uncredited)

Lieutenant (uncredited)

Captain (uncredited)

Man with Finch (uncredited)

Mrs. Gill (uncredited)

Fisherman (uncredited)

Petty Officer (uncredited)

Lookout (uncredited)

Recruiting Officer (uncredited)

Survivor (uncredited)

Lookout (uncredited)

Sailor (uncredited)

Fisherman (uncredited)

Fisherman (uncredited)

Surgeon (uncredited)

Fisherman (uncredited)

Wireless Operator (uncredited)

Boy (uncredited)

Signalman (uncredited)

Sailor (uncredited)

Fisherman (uncredited)

Fisherman (uncredited)

Nurse (uncredited)

Radio Operator (uncredited)

Orderly (uncredited)

Fisherman (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)

Sailor (uncredited)

German Sailor (uncredited)

Shore Patrol Sailor (uncredited)

Young German Sailor (uncredited)

Junior Officer Standing by Map (uncredited)

German Officer (uncredited)

German Sailor (uncredited)

Sailor (uncredited)