The objective of the mission is to infiltrate a russian submarine and use its weaponry(cruise missiles) on the rest of the russian fleet off, the east coast of the united states.
However, the mode of infiltration was via scuba diving with the aid of mini underwater vehicles that had mine detection sonar.
My question is if such an infiltration is possible in real life without the submarines sonar picking up sound signature from the approaching divers(delta operatives) and the mine detection sonar they used?
If so what would be the defensive action to be taken by the submarine ? Would it be to:
1.) send a counter team of scuba divers to eliminate the approaching delta team?
2.)is it possible to blow up the delta team with a torpedo?
Your oppinion would be appreciated.

Blowing up the boat with a torpedo would be an unlikely recourse,the boat was coming in too fast and in the direction of the sub.

I think detection by radar might be hard since the boat was made from rubber. Not sure, just guessing. Besides the ocean was at that point filled with many other vessels.

What the could have been done was to ensure that the sub was not boarded at all.