Chapter 81 Who's knocking? It's haunted!

"Thump."

The muffled thud wasn't particularly loud in the cabin of the "Seawolf," which was filled with background noise from various equipment.

But it was too abrupt.

It's like being in a quiet library when someone suddenly scratches the blackboard with their fingernail.

Sonar soldier Tom was wearing headphones and dozing off.

The sound suddenly entered his ears, startling him and instantly waking him up.

"Um?"

He frowned, took off his headphones, and shook his head.

Auditory hallucination?

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