Sandia designed a nuclear warning that works without language

The US Department of Energy's Waste Isolation Pilot Plant (WIPP), a deep geological repository for radioactive waste near Carlsbad, New Mexico, is regulated to remain hazardous and require active avoidance for roughly 10,000 years after closure — a time horizon longer than written language has existed, let alone any single nation, religion, or institution.

' The panel's task was not to write better warning text — it was to figure out what could possibly communicate 'danger, stay away' to a future human, or even a non-human intelligence, whose language, technology level and cultural frame of reference are all fundamentally unknowable from the present.

Made raw physical form the primary channel—spikes, disorienting scale, menace—so the warning reads as unnatural to any observer, with text only as a secondary layer.

Physical menace triggers instinctive avoidance in any human, bypassing language.

Text layered as secondary channel preserves detail if languages survive.

Avoiding monument-like forms prevents misinterpretation as a place of honor.

Interdisciplinary panel ensured the design considered cultural and perceptual diversity.

For messages that must survive institutional or linguistic discontinuity, encode meaning in universal physical cues (threat, unnaturalness) rather than shared symbols.

The 1993 Sandia report and its four-tier messaging framework — rudimentary presence, cautionary danger, basic explanatory information, and complex technical detail — became the reference design study cited in US federal regulatory guidance for long-term nuclear waste marker systems, and equivalent expert panels in Germany and elsewhere have since built on the same non-linguistic design principles for their own deep repositories.