In the course of selecting a route that lacks any archaeological artefacts and in order to construct an appropriate access path to Kangelo Fort in Savadkouh at Mazandaran Province, an activity was done in the form of sounding operation by considering as a test (trial) and it led to discovery of a rare grave with burial structure formed by Embryonic Method plus the related objects relating to the late Sassanid era as well as two graves from Islamic period. Sassanid grave differs from the usual type of burials at this period and from author’s viewpoint, in addition to signifying to duration of a very older tradition, it refers to emphasis of the ruling king of northern Iran on his preceding customs and its people. As we know, Zoroasterianism was the official religion during Sassanid Empire. This religion was followed by variation in religious rites while by virtue of text of “Letter of Tosar” (high priest during Ardashir, Sassanid King) as compiling the valid theological texte during Sassanids, the independent king of Gilan and Mazandaran rejected to accept this religion; one that was declared formally as the main religion throughout the Iranian Monarchical Realm. And also he accused Ardashir to heresy and heterodoxy to tradition (Zorosterian Orthodoxy). In this paper, we will introduce the aforesaid burial method and its findings rather than description of sounding operation.