How to test Concrete Bridges with GPR | Ground Penetrating Radar | Structural Engineering

Ground-penetrating radar picked up an impossible find: a massive, eight-sided structure made of solid black material beneath the Antarctic ice. This isn't just a bump in the ice—it's a 23ft deep enigma with a huge door that seems too big to be natural. Was it left by an ancient civilization or is this proof of a modern, secret base? Watch the full episode, for free, here: https://cs-link.gaia.com/ETsBeneaththeIce #AntarcticaSecrets #UFO #HiddenTruth #Antarctica⁠ ⁠ ⁠ Series: Beyond Belief⁠ Episod