Yuki was jolted awake by the vibrations and quickly pulled out the storage device from his wrist.
——That noise...was it from the mid-section mines?
Submarines, after all, have ballast tanks. The ballast tanks are located between the inner and outer shells, and they are quite thick.
Under normal circumstances, when enemies invade submarines, they use the hatches.
Of course, people who can easily tear through two layers of steel are exceptions. But in an underwater environment, the resistance of seawater is considerable, and most prosthetic bodies don't have the ability to tear through two layers of steel at once.
And using gunpowder to blast a hole makes it hard to ensure "only the right-sized hole is created" instead of "blasting the submarine entirely."
Therefore, for intruders, "the hatch" becomes the most vulnerable spot on the submarine.
Naturally, laying mines here is necessary.
It's a very logical thing to do.
