Level I: Rudimentary Information: "Something man-made is here"
Level II: Cautionary Information: "Something man-made is here and it is dangerous"
Level III: Basic Information: Tells what, why, when, where, who, and how
Level IV: Complex Information: Highly detailed written records, tables, figures, graphs, maps and diagrams
Message
The Sandia report aimed to communicate a series of messages non-linguistically to any future visitors to a waste site. It gave the following wording as an example of what those messages should evoke:
Written messages
The Waste Isolation Pilot Plant has done extensive research in development of written or pictorial messages to warn future generations. Since today's written languages are unlikely to survive, the research team has considered pictograms and hostile architecture in addition to them. Texts were proposed to be translated to every UN written language. Conceptual designs for the Waste Isolation Pilot Plant included an "Information Center" at the geometric center of the site. The building would be an open structure of solid granite or concrete, measuring, and contain Level IV messages. The plans included a suggestion that the building be designed so as to create a distinctive whistling sound when wind blew through it, drawing attention to itself. Working as part of the Human Interference Task Force in 1981, Vilmos Voigt from Eötvös-Loránd University proposed the installation of warning signs in the most important global languages in a concentric pattern around any terminal storage location. As time passed, further signs would be added translating the earlier signs, with the earlier ones remaining in place.
Physical markers
The Sandia report explored designs for physical markers which conveyed the concepts of dangerous emanations, shapes that evoke bodily harm, and the concept of "shunned land" that appears destroyed or poisoned. The designs suggested included: ;Landscape of Thorns: A mass of many irregularly-sized spikes protruding from the ground in all directions. ;Spike Field: A series of extremely large spikes emerging from the ground at different angles. ;Spikes Bursting Through Grid: A large square grid pattern across the site, through which large spikes protrude at various angles. ;Menacing Earthworks: Large mounds of earth shaped like lightning bolts, emanating from the edges of a square site. The shapes would be strikingly visible from the air, or from artificial hills constructed around the site. ;Black Hole: An enormous slab of basalt or black-dyed concrete, rendering the land uninhabitable and unfarmable. ;Rubble Landscape: A large square-shaped pile of dynamited rock, which over time would still appear anomalous and give a sense of something having been destroyed. ;Forbidding Blocks:A network of hundreds of house-sized stone blocks, dyed black and arranged in an irregular square grid, suggesting a network of "streets" which feel ominous and lead nowhere. The blocks are intended to make a large area entirely unsuitable for farming or other future use.
Cultural memory
Linguist Thomas Sebeok, building on earlier work by Alvin Weinberg and Arsen Darnay and working as part of the Human Interference Task Force, proposed the creation of an atomic priesthood, a panel of experts comparable to the Catholic church, which has preserved and authorized its message for almost 2,000 years. The priesthood would preserve the knowledge of radioactive waste's locations and dangers through rituals and myths. French author Françoise Bastide and Italian semiotician Paolo Fabbri proposed that domestic cats be genetically engineered to change color in the presence of dangerous levels of radiation. The significance of these "radiation cats" or "ray cats" would be reinforced through fairy tales and myths, the story being that one should move away from sites where such creatures are encountered, or where domesticated cats begin to exhibit such behaviour.
