Expedition Unknown | Josh Gates Uses Modern Technology to Uncover the Age of a Tomb

There are moments in archaeology when the past feels close enough to touch — and then there are moments when science steps in and pulls back the veil even further. Traveling with Josh Gates deep into the carved sandstone chambers of Petra, I witnessed firsthand how modern technology can illuminate histories that have been silent for centuries.

Our mission centered on a remarkable technique known as optically stimulated luminescence, or OSL — a method capable of determining the last time soil was exposed to sunlight. By measuring trapped electrons inside sediment grains, OSL can reveal when a tomb was sealed, offering a scientific timestamp for ancient burials. For archaeologists, it is nothing short of revolutionary.

To ensure the accuracy of the data, we had to work in absolute darkness. As we entered the tomb, headlamps switched to red filters, and finally off completely. The air was cool and perfectly still, broken only by the soft scrape of trowels and the quiet instructions exchanged between the OSL specialist and our team. Every movement had to be deliberate. A single stray beam of light could contaminate the sample, erasing centuries of information.

Josh carefully assisted as the specialist slid opaque tubes into the soil layers, sealing away each sample like a fragile piece of time itself. Once secured, the tubes were tucked into lightproof containers for later laboratory analysis.

Inside that silent chamber — surrounded by stone carved thousands of years ago — I felt the extraordinary tension between ancient history and cutting-edge science. Here we were, using modern physics to decipher choices made by people who lived, died, and were laid to rest long before our world took shape.

Working alongside Josh Gates, I was reminded again that archaeology is no longer just about digging. It is about listening, with tools sophisticated enough to hear the faintest whispers of the past.