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Here we show that this barrier can be breached under extreme space weather conditions. Using continuous near\u2010equatorial observations from the Arase satellite, we show that the May 2024 superstorm rapidly generated multi\u2010MeV electrons deep inside the inner magnetosphere. Phase space density profiles reveal the development of a local maximum at\n                    <jats:italic>L*<\/jats:italic>\n                    \u00a0\u223c\u00a03, providing evidence that local in situ acceleration established multi\u2010MeV electron source before supplying inward and outward radial diffusion. Simultaneous observations of intense chorus waves under a strongly depleted plasma region, maintained by enhanced convection and a negative ionospheric storm, are consistent with chorus\u2010driven local acceleration. These findings demonstrate that local acceleration can establish a multi\u2010MeV electron source inside the impenetrable barrier under extreme space weather conditions.\n                  <\/jats:p>","DOI":"10.1029\/2026gl125879","type":"journal-article","created":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T13:00:43Z","timestamp":1793019643000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Local Acceleration of Multi\u2010MeV Electrons Inside Earth's Impenetrable Barrier During the May 2024 Superstorm"],"prefix":"10.1029","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7998-1240","authenticated-orcid":false,"given":"Y.","family":"Miyoshi","sequence":"first","affiliation":[{"name":"Institute for Space\u2010Earth Environmental Research Nagoya University  Nagoya Japan"},{"name":"Kyung Hee University  Swon 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