I have sketched some plans to build a deck off my master bedroom. I would like to include a hot tub that is sunken so entering he hot tub is simply stepping down into it. I want this deck built at the same finished level as the master bedroom. The grade of my yard in only about 4-6" below the finished floor of the master. I do have a french drain running along the area but its only another 6" deep. I expect to put a retaining wall around the hot tub and build the deck over this dug out area. Has anyone been involved with installing a sunken hot tub? Thank you in advance.