{
  "company": {
    "name": "Deep Fission",
    "website": "https://deepfission.com/",
    "record": "https://startuphistory.org/c/deepfission.com"
  },
  "status": null,
  "history_since": "2023-07-22T09:37:53.000Z",
  "baseline": {
    "snapshot_id": "d00ca9138598ed6f6ab2a3d90ac1716816f5e2dee4f35a46e5a770467aa89401",
    "observed_at": "2023-07-22T09:37:53.000Z",
    "headline": "Deep Fission – A Nuclear Reactor Under 10 Billion Tons of Rock",
    "description": "A Nuclear Reactor Under 10 Billion Tons of Rock",
    "evidence": "https://web.archive.org/web/20230722093753/https://deepfission.com/",
    "evidence_kind": "internet_archive",
    "facts": null,
    "basis": "first_observation",
    "is_change": false
  },
  "live_captures": 1,
  "last_checked": "2026-11-05T13:20:29.368Z",
  "live_status": null,
  "messaging": [
    {
      "quote_observed_at": "2024-06-04T03:01:15.000Z",
      "variants": [
        {
          "headline": "Deep Fission – A Nuclear Reactor Under 10 Billion Tons of Rock",
          "subhead": "A Nuclear Reactor Under 10 Billion Tons of Rock",
          "observed_at": "2023-07-22T09:37:53.000Z",
          "evidence": "https://web.archive.org/web/20230722093753/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        },
        {
          "headline": "Deep Fission – A Nuclear Reactor Under 10 Billion Tons of Rock",
          "subhead": "A Nuclear Reactor Under 10 Billion Tons of Rock",
          "observed_at": "2024-06-04T03:01:15.000Z",
          "evidence": "https://web.archive.org/web/20240604030115/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        }
      ],
      "headline": "Deep Fission – A Nuclear Reactor Under 10 Billion Tons of Rock",
      "subhead": "A Nuclear Reactor Under 10 Billion Tons of Rock",
      "from": "2023-07-22T09:37:53.000Z",
      "to": "2024-06-04T03:01:15.000Z",
      "captures": 2,
      "evidence": "https://web.archive.org/web/20240604030115/https://deepfission.com/",
      "evidence_kind": "internet_archive",
      "seen": {
        "between": {
          "from": "2023-07-22T09:37:53.000Z",
          "to": "2024-06-04T03:01:15.000Z"
        }
      },
      "current": false
    },
    {
      "quote_observed_at": "2025-01-07T21:10:54.000Z",
      "variants": [
        {
          "headline": "The Future of Nuclear Energy",
          "subhead": null,
          "observed_at": "2024-07-16T13:02:48.000Z",
          "evidence": "https://web.archive.org/web/20240716130248/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        },
        {
          "headline": "The future of nuclear will be boring",
          "subhead": "Innovative US nuclear energy company Deep Fission launches underground scalable 15MW, affordable, small modular reactors.",
          "observed_at": "2025-01-07T21:10:54.000Z",
          "evidence": "https://web.archive.org/web/20250107211054/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        }
      ],
      "headline": "The future of nuclear will be boring",
      "subhead": "Innovative US nuclear energy company Deep Fission launches underground scalable 15MW, affordable, small modular reactors.",
      "from": "2024-07-16T13:02:48.000Z",
      "to": "2025-01-07T21:10:54.000Z",
      "captures": 2,
      "evidence": "https://web.archive.org/web/20250107211054/https://deepfission.com/",
      "evidence_kind": "internet_archive",
      "seen": {
        "between": {
          "from": "2024-07-16T13:02:48.000Z",
          "to": "2025-01-07T21:10:54.000Z"
        }
      },
      "current": false
    },
    {
      "quote_observed_at": "2026-01-06T22:31:46.000Z",
      "variants": [
        {
          "headline": "Powering Humanity from a Mile Underground",
          "subhead": null,
          "observed_at": "2025-07-15T16:31:01.000Z",
          "evidence": "https://web.archive.org/web/20250715163101/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        },
        {
          "headline": "Powering Humanity from a Mile Underground",
          "subhead": "A pioneering advanced nuclear energy company placing small modular pressurized water reactors in boreholes one mile underground.",
          "observed_at": "2026-01-06T22:31:46.000Z",
          "evidence": "https://web.archive.org/web/20260106223146/https://deepfission.com/",
          "evidence_kind": "internet_archive"
        }
      ],
      "headline": "Powering Humanity from a Mile Underground",
      "subhead": "A pioneering advanced nuclear energy company placing small modular pressurized water reactors in boreholes one mile underground.",
      "from": "2025-07-15T16:31:01.000Z",
      "to": "2026-01-06T22:31:46.000Z",
      "captures": 2,
      "evidence": "https://web.archive.org/web/20260106223146/https://deepfission.com/",
      "evidence_kind": "internet_archive",
      "seen": {
        "between": {
          "from": "2025-07-15T16:31:01.000Z",
          "to": "2026-01-06T22:31:46.000Z"
        }
      },
      "current": false
    },
    {
      "quote_observed_at": "2026-11-05T13:20:29.368Z",
      "variants": [
        {
          "headline": "Deep Fission, Inc.",
          "subhead": "Deep Fission is an advanced nuclear energy company developing small modular pressurized water reactors designed to operate one mile underground. Advanced nuclear for the AI era.",
          "observed_at": "2026-07-14T10:55:21.000Z",
          "evidence": "https://web.archive.org/web/20260714105521/https://www.deepfission.com/",
          "evidence_kind": "internet_archive"
        },
        {
          "headline": "Deep Fission, Inc.",
          "subhead": "Deep Fission is an advanced nuclear energy deployment company developing small modular pressurized water reactors designed to operate one mile underground. Advanced nuclear for the AI era.",
          "observed_at": "2026-10-07T14:19:04.000Z",
          "evidence": "https://web.archive.org/web/20261007141904/https://www.deepfission.com/",
          "evidence_kind": "internet_archive"
        },
        {
          "headline": "Deep Fission, Inc.",
          "subhead": "Deep Fission is an advanced nuclear energy deployment company developing small modular pressurized water reactors designed to operate one mile underground. Advanced nuclear for the AI era.",
          "observed_at": "2026-11-05T13:20:29.368Z",
          "evidence": "https://www.deepfission.com/",
          "evidence_kind": "live_capture"
        }
      ],
      "headline": "Deep Fission, Inc.",
      "subhead": "Deep Fission is an advanced nuclear energy deployment company developing small modular pressurized water reactors designed to operate one mile underground. Advanced nuclear for the AI era.",
      "from": "2026-07-14T10:55:21.000Z",
      "to": "2026-11-05T13:20:29.368Z",
      "captures": 3,
      "evidence": "https://www.deepfission.com/",
      "evidence_kind": "live_capture",
      "seen": {
        "between": {
          "from": "2026-07-14T10:55:21.000Z",
          "to": "2026-11-05T13:20:29.368Z"
        }
      },
      "current": true
    }
  ],
  "changes": [
    {
      "n": 1,
      "id": "page-9a6b41d41f54b4020285186a74809d99929b21118bde07f88427196b6844e1a4:d565b14aa8afb79bf9687b18e9cfde7f7c457a2620bbe5e9f6b0216b298fca07:headline:aa3354b945d2dbed",
      "before_evidence": "https://web.archive.org/web/20250107211054/https://deepfission.com/",
      "before_evidence_kind": "internet_archive",
      "kind": "headline",
      "label": "Headline",
      "summary": "Changed its homepage headline from “The future of nuclear will be boring” to “Powering Humanity from a Mile Underground”.",
      "between": {
        "from": "2025-01-07T21:10:54.000Z",
        "to": "2025-07-15T16:31:01.000Z"
      },
      "evidence": "https://web.archive.org/web/20250715163101/https://deepfission.com/",
      "evidence_kind": "internet_archive",
      "basis": "page_facts",
      "topic": null
    },
    {
      "n": 2,
      "id": "page-c780e3263766d2422de206ac8431beaa95ad79adf1e82768f4a89de1c7a21d47:3be4b1538c9201f74b7758a2fad7d7b5c0886a12d6796ef3b90b060388190b6f:headline:a22afe11daf80dc1",
      "before_evidence": "https://web.archive.org/web/20260106223146/https://deepfission.com/",
      "before_evidence_kind": "internet_archive",
      "kind": "headline",
      "label": "Headline",
      "summary": "Changed its homepage headline from “Powering Humanity from a Mile Underground” to “Deep Fission, Inc.”.",
      "between": {
        "from": "2026-01-06T22:31:46.000Z",
        "to": "2026-07-14T10:55:21.000Z"
      },
      "evidence": "https://web.archive.org/web/20260714105521/https://www.deepfission.com/",
      "evidence_kind": "internet_archive",
      "basis": "page_facts",
      "topic": null
    },
    {
      "n": 3,
      "id": "page-c780e3263766d2422de206ac8431beaa95ad79adf1e82768f4a89de1c7a21d47:3be4b1538c9201f74b7758a2fad7d7b5c0886a12d6796ef3b90b060388190b6f:hiring:20dd4c09cc4ab0aa",
      "before_evidence": "https://web.archive.org/web/20260106223146/https://deepfission.com/",
      "before_evidence_kind": "internet_archive",
      "kind": "hiring",
      "label": "Hiring",
      "summary": "Added a careers page.",
      "between": {
        "from": "2026-01-06T22:31:46.000Z",
        "to": "2026-07-14T10:55:21.000Z"
      },
      "evidence": "https://web.archive.org/web/20260714105521/https://www.deepfission.com/",
      "evidence_kind": "internet_archive",
      "basis": "page_facts",
      "topic": "https://startuphistory.org/t/added-careers-page"
    }
  ],
  "update": null,
  "method": {
    "version": "messaging-v1",
    "description": "https://startuphistory.org/method"
  },
  "license": "CC-BY-4.0",
  "cite": "StartupHistory, “Deep Fission” company record, https://startuphistory.org/c/deepfission.com"
}