With all his might, Arthur used the crowbar as a lever, pressing it against the door… but it had no effect. Then, suddenly, they heard the noise again. What on earth was behind that door? Arthur was determined to solve this mystery. They would have to go back to their campsite to retrieve more tools.
The scientist could sense the importance of what was in that room. To avoid getting lost on their way back, Arthur and his team decided to mark the corridors leading back to the helicopter.