- Vladimir Ivashov
- Commander of the border ship
- Aleksandr Martynov
- Commander's assistant
- Regina Razuma
- Interrogator
- Aleksandr Yakovlev
- Chief investigator
- Aleksandr Cherkasov
- Navigator of the border ship
- Talgat Nigmatulin
- Captain of the schooner 'Kiyoshi'
- Oleg Li
- Telegraphist of 'Kiyoshi'
- Mentay Utepbergenov
- Navigator of "Kiyoshi"
- Bolot Beyshenaliev
- Barge-skipper of the schooner 'Miki-18'
- Yuriy Mayganashev
- Telegraphist of 'Mik-18'
- Viktors Lorencs
- 'Chief', an intelligence representative
- Aleksandr Yanvaryov
- (as A.Yanvaryov)
- Nikolay Pogodin
- (as N.Pogodin)
