The Soviet T-15 strategic nuclear torpedo

What was the purpose of the Soviet T-15 giant strategic nuclear torpedo?

It was conceived as a city-killing weapon launched from a modified submarine, but Admiral Kuznetsov stopped the project.

The T-15 concept paired an exceptionally large nuclear torpedo with a modified submarine. Its scale made the weapon strategic rather than a normal anti-ship torpedo. The concept aimed to destroy coastal cities through a vast blast or wave effect. Admiral Nikolai Kuznetsov stopped a project whose mission crossed from naval combat into indiscriminate city destruction.