Theres a small hole in each of the front , middle and back room , linking the immeasurable underground part 洞室四壁洞套洞洞连洞，前中后室角落各一小洞垂直通往地下，深不可测。
2.
To expose the posterior compartment , make a second deep incision posterior to the tibial collateral ligament , from the level of the femoral epicondyle straight distally across the joint line 再在胫侧副韧带后方从股骨内上髁水平垂直向远端跨过关节间隙做深层切口，即可显露关节后室。
3.
In the front room , there is the shield gods joss . in the middle room , there are the josses of the three star primogenitors fu luck , lu wealth , shou longevity . in the back room , there is the joss of doumu who is said to be the mother of the big dippers 洞内前宝供奉“护法天尊”像,中室西壁天然石台上,坐西朝东供奉“福禄寿”三星神像,后室供奉“斗姆”像,斗姆是北斗众星之母。
