Dive into the process of constructing an incredible secret underwater house, complete with an underground passage leading to hidden areas. This video showcases the stunning design and unique features ...

Once only indicated through a sketch by Leonardo da Vinci from around 1495, concealed passageways have been discovered ...

Watch as we construct the ultimate secret underwater house with a hidden underground passage! 🏗️🌊 This one-of-a-kind build combines expert craftsmanship with stealthy design, creating a ...

may have been responsible for the secret passages found under the Sforza Castle in Milan. Sketches from around 1495 by the renowned inventor reference underground passageways underneath the ...

One of them is Carn Euny in Cornwall, which dates back 1,500 years and contains a secret 65ft underground tunnel ... prospecting in the area. The passage stretches over 65 feet (20 metres ...