With pleasure! Here is the easy-to-understand, yet serious-sounding wording of the original warning:

Caution – Archaeological Excavation!
This is a scientific excavation and not a weapons laboratory.
Nevertheless:
Unexpected dangers may arise due to ancient structures or hidden systems.
Toxic gases could escape or automatic defense mechanisms could be activated.
Due to possible system weaknesses, it cannot be ruled out that you could also be affected or attacked.
Please enter the site only with protective equipment and with caution.

If you wish, I can also create a stylized version in the style of a warning sign, military jargon, or sci-fi terminal.

This is an archaeological excavation. This is a warning. Due to systematic weakness, you may also be attacked. This is not a weapons laboratory, but who knows what kind of gases are escaping.