I like to brainstorm "engineering black swan events", and thought it would be interesting to use torpedoes/unmanned submersible IEDs/fertilizer-filled bulk frei

I like to brainstorm "engineering black swan events", and thought it would be interesting to use torpedoes/unmanned submersible IEDs/fertilizer-filled bulk freighters to attack major container ports, while simultaneously shorting the stocks of the publicly-traded companies that own/operate them. They seem like a very vulnerable part of the world's economy/supply chain.