"Not only was the cleansing process strictly proscribed", Cohen adds, "but also the building process had very specific rules too: No metal could be used in its construction because metal may have been used to kill someone. No pottery could be used to make the plaster because that pottery may have been used in a sacrifice to another God.The water must be part rainwater and part spring water. And there were many more rules, all of which make the presence of the mikveh in this very inaccessible place even more remarkable. It must have taken a lot of resources and time to build; the temperatures in the desert seldom drop below 40c, the climb is extremely dangerous, water is scarce, carrying building materials was difficult and so on." 
According to Cohen, the location of the mikveh therefore begs the question about why a facility like this was built here.
"This is the question we are hoping to answer when we excavate the cave in the 2012 season (beginning October 28)," says Cohen. "Academia have now accepted that what was previously thought to be a cistern or a pool is, in fact, a mikveh, and we must build from there. We want to know what was in this cave that meant a mikveh was necessary. Scrolls? Temple artefacts?" 
Cohen suggests that the cave may possibly have been, like the caves that harbored the Dead Sea Scrolls, a repository for sacred documents or artifacts, such as the lost archives of the Jewish Second Temple, possibly hidden away for protection and safekeeping from the Roman forces during the unrest of the ist century A.D. Revolt. Among the finds was additional evidence of possible priestly activity -- a leather scroll cover.
Equally interesting is a sealed cave that was discovered in a steep ravine not far from Cave 27 by Cohen during a 2007 survey. Cohen and his team hope to further explore this cave concurrent with their excavations of the Mikveh Cave. He and his colleagues ae requesting additional funding and participation to make it possible.
Says Cohen: "After so many real and metaphorical mountains to climb - we are now committed to a dig starting on the 28th of October and ending on the 16th of November this year. Licences have been granted by both the Israel Antiquities Authority and the Park Authority, allowing an expedition to excavate one cave, and survey another."
For more information about the expedition and how one can support and participate in the effort, see the website, Origins Discovery Project.