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# What Fish Revealed About This Mysterious Grave
- URL: https://www.cascadepbs.org/show/nova/extras/what-fish-revealed-about-this-mysterious-grave-ko8oif/
- Published: 2025-07-08T07:45:49.000Z
- Updated: 2025-07-08T08:00:06.000Z
- Description: Could these bones be the last remains of a legendary Viking army?
- Author: Cascade PBS Staff
- Tags: NOVA, #ZZZ_Show_8f1ff589-6222-4260-acbf-0523a6424abf, #v1.6, #ZZZ_Extra_2aac707c-f817-4646-8b73-be09aad490ac, #extra

Archaeologists discovered a mass grave of what they thought to be ninth-century Vikings. But for some reason, the radiocarbon dates of their bones, found by measuring a radioactive carbon isotope, appeared much older.