Retired scientist William Treurniet writes about two experiences sitting with Paul and the Zeta's. where he encountered an energetic structure referred to as a dome. In a later sitting, the Zeta's confirmed that the dome was intended to protect dematerialized Zeta bodies from electromagnetic noise in the environment, facilitating freedom of movement between their craft and the séance venue.
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A similar energetic structure is described in relation to the Rendlesham Forest UFO incident in the following video: