The San Diego Zoo Wildlife Alliance’s Frozen Zoo began in 1975 and is described as the world’s largest initiative of its kind. It cryopreserves cells and reproductive materials—including sperm, oocytes, embryos and primarily skin-derived cell lines—from wildlife and plants in liquid nitrogen at temperatures as low as -196°C. The programme is expanding through conservation hubs in Peru, Kenya, Vietnam and Hawai‘i. A parallel sequencing partnership plans to generate whole-genome data for up to 4,000 samples representing 1,300 species; the collection reportedly contains more than 11,500 samples from 4,000 individuals across those 1,300 species.[1][4][5]
The central technical lesson is that preservation must retain viable cells, not only DNA sequences. Cryogenic storage can maintain living biological material for future propagation, while genomic and multiomic sequencing preserves reference data for cases where cells are damaged or unavailable. For a lunar repository, the system must address continuous power, liquid-nitrogen production or replenishment, radiation shielding, contamination control, sample metadata, genetic representation across populations, and independent terrestrial backups. A bank of isolated samples alone cannot restore ecosystems without host species, reproductive protocols, microbial partners and suitable habitats.
The Ark team should monitor the Frozen Zoo’s expansion into Peru, Kenya, Vietnam and Hawai‘i; track the 4,000-sample, 1,300-species sequencing effort; and pursue formal partnerships with the San Diego Zoo Wildlife Alliance, IUCN Species Survival Commission and comparable biobanks. Design requirements should include paired cryogenic and digital genomic archives, duplicate samples stored at separate lunar sites, population-level rather than single-individual sampling, and validated thawing, cell-culture and assisted-reproduction protocols before launch.