The new sauna is called Zeed Camp, located on Intamara rd. betweens soi 1 and 3, on the way from Suthisan to Saphan Kwai. It was first launched as 729 Tunnel sauna, but accordning to most posts on the Thai web board TMM Society (Thai Male Massage Society), it has not been very successful in attracting a large number of customers in either of its apparitions, although the facilities, large and warehouselike, should be well suited for and exciting sauna. There are several threads about it on TMM Society.
http://www.thailandout.com/zeed/index.php