A wall is constructed to conceal a room underground and show no sign of it from the outside... A sunken courtyard is the location. This method of brick laying is known as Rat trap bond. Rat trap bond is a brick masonry method of wall construction, in which bricks are placed in vertical position instead of conventional horizontal position and thus creating a cavity (hollow space) within the wall. Architect Laurie Baker introduced it in Kerala in the 1970s and used it extensively for its lower construction cost, reduced material requirement and better thermal efficiency than conventional masonry wall, without compromising strength of the wall. Source: www.istudioarchitecture.com/ This footage is part of the professionally-shot broadcast stock footage archive of Wilderness Films India Ltd., the largest collection of HD imagery from South Asia. The collection comprises of 100, 000+ hours of high quality broadcast imagery, mostly shot on HDCAM / SR 1080i High Definition, Alexa, SR, XDCAM and 4K. Write to us for licensing this footage on a broadcast format, for use in your production! We are happy to be commissioned to film for you or else provide you with broadcast crewing and production solutions across South Asia. We pride ourselves in bringing the best of India and South Asia to the world... Please subscribe to our channel wildfilmsindia on Youtube for a steady stream of videos from across India. Also, visit and enjoy your journey across India at www.clipahoy.com , India's first video-based social networking experience! Reach us at rupindang [at] gmail [dot] com and [email protected] To SUBSCRIBE click the below link: www.youtube.com/subscription_center?add_user=WildFilmsIndia Like & Follow Us on: Facebook: www.facebook.com/WildernessFilmsIndiaLimited Website: www.wildfilmsindia.com