US also non-surprisingly attempted to block all 'allied' businesses from contributing to soviet deep sea capabilities. The story of Mir submarines is an intere

US also non-surprisingly attempted to block all 'allied' businesses from contributing to soviet deep sea capabilities. The story of Mir submarines is an interesting example of cold war era business: https://en.m.wikipedia.org/wiki/Mir_(submersible) https://en.m.wikipedia.org/wiki/Mir_(submersible)