Discovery Channel: Submarines - Sharks Of Steel 1of4: The Submariners
Channel: Zsolt Szekretár
Date: 2014-07-31

All rights reserved: Discovery Channel

2of4: https://www.youtube.com/watch?v=rikT29rkv-U
3of4: https://www.youtube.com/watch?v=C9-oD8gJw8k
4of4: https://www.youtube.com/watch?v=BC5S9-l2VQ0