The Mystery Solved

The Spire had always been heavily fortified. The underground base was more than seven hundred meters underground, only accessible by two elevators. The entrance of these two elevators was guarded by nuclear bunker gates capable of withstanding the brunt explosive force tactical nuclear warheads. The exterior of the Spire laboratory was also fortified with alloy plating capable of withstanding battle tank shells.

Furthermore, the level-five biosafety laboratory was equipped with a complete liquid nitrogen cooling system and a fire suppression system. The researchers dubbed it as the "ultimate bunker laboratory". Any creature contained inside this laboratory could only ever dream of breaking out of its confinement!