It's just a theory...up for discussion. You seemed to ruled it out with out investigating it thoroughly.
Your reply...I read about it in the news.
here's what some are saying:
Mega Torpedo Tonga Underwater “Volcano” Event And Shockwave Is The Proof?!! Russian Intel Suggests “Volcanic” Eruption Was American Poseidon Mega Torpedo That “Went Missing”!! Pacific Ocean 911 Event?
The article says:
Now listen… it can appear a bit confusing… here’s what it looks like… the American media was doing it’s predictive programming thing by suggesting Russia was up to no good… meanwhile, their own mega torpedo went ‘missing’… or did they just say that, because they planned on using it… but for what? What would the strategy be to set off a torpedo in the Tonga area? Let’s surmise:
1. To cause chaos.
2. To halt shipping supplies to America and the world.
3. To keep Americans in fear.
4. TO SET OFF MASSIVE EARTH CHANGES.
5. To destroy the Pacific Ocean, to destroy a major food source for the world.
6. To blame nature or Russia for a disaster.
There's more to the article.
Interesting, "Russian intel" says the USA did it.