The I-400 submarine was known as an underwater aircraft carrier, and this one had set out from Lushun Port in Xia Country.
Filled with treasures, it simply took them along en route, but its primary purpose was to refuel with enough diesel to travel nearly 30,000 kilometers!
Such a long voyage was for the purpose of carrying out the infamous "px operation".
This operation aimed to launch an attack on the mainland of the Star Alliance Country.
At that time, the He Kingdom finished human experiments on innocent people from Xia Country and some Western prisoners of war, developing terrible bacterial weapons,
The "px operation" was specifically to drop bacterial bombs on densely populated areas of the West Coast of the Star Alliance Country using this kind of "underwater aircraft carrier" that carried airplanes.
Unfortunately, before its ambition could be fulfilled, it sank, and the metal canisters in the cargo hold contained the bacterial weapons that hadn't yet been used!
