Before he could fully comprehend this rather new sound, the situation developed to a strongly unfavourable position. It reached to the point where he wasn't allowed to think anymore, as hostility was dripping from above.
He had to rely on other things instead, like pure instinct. It was this perk that had made him swiftly swim forwards, for the sake of avoiding whatever trouble was trying to poke its ugly head.
Thanks to the burst of energy, he had reached the very end of the tunnel; and smashed against its dirty wall a little bit, but thankfully that did not cause him any health loss.
The situation had developed for the worst in a matter of seconds, even though he was yet to understand how it happened.
Confusion regardless, the situation was still dire because most of the ceiling of this tunnel had fallen down! It had enveloped the little structure with dirt and rocks alike, but there was something else to it.