Experts

His eyes could see past the walls and see the situation below.

For example, there was a coffin and several items in the closest tomb.

However, the corpses in the tombs were all powerful being when alive. Even when they were dead, they radiated powerful aura's that made mortals unable to breath.

These corpses were all at least of the galaxy Realm when alive.

David didn't make any rash moves. The tombs here were weird and sinister.

It seemed as if they were bowing down to something and was funerary.

Anyone would be wary and cautious if they entered here.

The entire place was dead silent, as if waiting for the day when one witnessed their past glory and fame.

David could confirmed that there was no "live" beings here and no danger. But the skeletons before were definitely not alive – who knew if there was other dangers?