Dulce Papers
The Dulce Papers are a set of documents, photographs, and video footage attributed to Thomas Edwin Castello, an alleged former security officer at Dulce Base who claims to have compiled and smuggled the materials out of the facility in the early 1980s before disappearing from public life. The papers describe the seven-level layout of Dulce Base in detail, with particular focus on the lower levels where genetic hybridization, mind control experiments, and storage of living humans were allegedly conducted jointly by human military personnel and non-human entities. The papers entered the UFO research community in the mid-1980s primarily through researchers John Lear and Bill Cooper, and reached broader audiences through internet distribution beginning in the 1990s. The narrative continues to circulate in fringe research communities; conspiracy researcher "Doc" summarized the core claim on The Fact Hunter podcast as "an underground base in Dulce, New Mexico, where alien species, quote, are allowed to, or were allowed to, at least experiment on humans" and described it as "nine stories underground."
Contents
Castello describes the Dulce Papers as a cache he assembled over time while employed at the facility, concealing copies in anticipation of going public. The package allegedly includes:
- Documents describing the seven-level layout and operational protocols of Dulce Base
- Photographs of non-human entities present in the lower levels
- Photographs of humans held in storage and cage areas on Level 7
- Video footage of the lower-level operations
- Technical documentation regarding genetic and biological operations
The documents describe Grey entities as the primary non-human presence throughout the lower levels, with Reptilian entities concentrated in the genetic laboratory sections. Level 7, described as the worst level, is depicted as containing row upon row of thousands of human and humanoid remains in cold storage, along with embryos of humanoids in various stages of development, and living humans held in cages -- some of whom Castello states begged for help when not fully sedated.
Structural parallels with S-4
The security architecture and biological containment protocols described by Castello at Dulce bear close comparison to those documented by Dan Burisch at the S-4 facility at Papoose Lake — suggesting a common institutional template for joint human-ET underground facilities. Burisch describes an oppressive security environment at S-4 in which armed guards dressed in black ("the black S's") maintained positions on every floor; personnel were required to disrobe, don jump suits, and remain strictly on designated walking lines, with explicit understanding that stepping too far out of bounds would result in being shot. The facility was maintained at temperatures Burisch described as extremely cool — functionally analogous to the cold-storage environment described by Castello on Dulce's lower levels.
Circulation and dissemination
Castello states he assembled the cache before his departure from Dulce Base, intending it as evidence of operations he believed the public needed to know about.
Cooper's antecedent claim
Bill Cooper, who became one of the primary distributors of the Dulce Papers in the late 1980s, had independently described a Dulce-related confrontation in his Majestic 12 and the Secret Government lecture series — drawn, he claimed, from classified materials he had handled as a naval intelligence briefing officer. According to Cooper, in 1969 there was an incident at the "Dulce Underground lab" in which a standoff between human scientists and non-human entities escalated into an armed confrontation: "In 1969, a confrontation broke out between the human scientists and the aliens at the Dulce Underground lab. The aliens took many of our scientists hostage. Delta forces were sent to free them but were no match against the alien weapons. 66% of our people were killed during this action. As a result, we withdrew from all joint projects for at least two years." Cooper's version pre-dates the Castello Papers' focus on the early 1980s period and describes an earlier stage of the joint program — suggesting the facility had a history of human-ET conflict predating Castello's tenure.