Despite the Philippines having a signed agreement with Japan, the Japanese, driven by fears of potential dethronement as one of the regional powers, chose to disregard the diplomatic accord.
Gaining entry into the Philippines proved to be a formidable challenge due to the existence of the Royal Intelligence Agency. The stringent border control measures were so effective that any spies Japan attempted to send were promptly arrested the moment they set foot on Filipino soil.
Given these challenges, the Japanese opted for a safer approach—utilizing submarines. Submarines, being harder to detect and evade by surface ships, provided a level of security unparalleled by other means. Their lower-profile cannons made them difficult targets, and the vast expanse of the ocean acted as a natural shield, concealing their movements beneath the waves.
Five minutes later, a faint thumping sound echoed from above, raising alarm among the crew.
