Raf Vallone as Carlo Ferri

Franco Fabrizi as Antonio

Ettore Manni as Marco

Andrea Checchi as Giorgio

Enrico Maria Salerno as Virgilio

Christian Marquand as Paolo

Bud Spencer as Magrini

Franco Chianese as Submariner

Emilio Cigoli as

Nerio Bernardi as Captain Mauri

Evar Maran as Survivor

Giovanni De Fazio as Pietro

Paolo Bergamaschi as Survivor #2

Elena Varzi as Anna Avanzi

Federico Scarlatti as Commandante sommergible

Albino Morandin as Capo pontone

Livio Lorenzon as Sergente

Cesare Fantoni as Ammiraglio a Roma

Saverio Capriò as Un terzo superstite

Dora Calindri as Madre di Virgilio

Gino Anglani as Agente segreto

Evar Maran as Un superstite

Emilio Cigoli as Ammiraglio Bragadin

Nerio Bernardi as Capitano Mauri

Paolo Bergamaschi as Un secondo superstite