Ultimate Source

According to Shen Kui, the relic's entrance was originally open. Was it not, how else could the research team have entered? Naturally, after the astounding findings, Genesis sealed and concealed the entrance.

If Shen Kui had not revealed the island's exact location, it would be impossible for the Shi Yung Squad to find it amongst the countless islands scattered in the Pacific Ocean.

After such a long time, the iron gate sealing the entrance had gathered rust. Unfortunately, Shen Kui did not know the code to open the gate, so Jiang Liushi had to use the Vulcan to force it open. Merely the recoil generated by the heavy machine gun could dislocate and brake a human's bones, but to Jiang Liushi it was nothing. 

Jiang Liushi poured all of his blue energy into the armor-piercing uranium bullets and then he pulled the Vulcan's trigger. In turn, the Vulcan spewed one-meter-long tongues of flame like a fierce monster.