[little jeremiah]

Her type of submarine most likely could not do (depths? other?) what would have to be done to cause one kilometer of damage by explosions.

Not that I know anything...

[reed13k]

Some smaller subs can actually go deeper than the bigger ones as they can be more spherical which gives them more structural strength....Don’t know what that little yellow submarine (wow know i have to go look up the lyrics to that song to see what might be buried in there) could do depth wise...

[TangoLimaSierra]

...what would have to be done to cause one kilometer of damage by explosions.

From what I've read, the bubbling at the surface was one K in diameter. Gas expands as it nears the surface. It wouldn't need to be that big of a break to cause that.

If what I read was correct.

[LonePalm]

If you are talking about Nord Stream 1&2, they are only about 210 feet down at that point. The Baltic is very shallow.

You can't tell the size of the break from the pattern since the gas would rise from the upstream end of any hole. The size is simply a function of the gas spreading as it goes up.

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)