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Archived Updates: Building 18 Incident

MIT Emergency Management archived updates regarding an incident at Building 18, which occurred from Thursday, August 27th to Sunday, August 30th, 2026. The updates detail a hazardous material incident involving a student who self-reported synthesizing dimethyl mercury.

Building 18 reopened at 6 a.m. on Monday, August 31st, after decontamination protocols were completed in the student's lab space. Decontamination of a sealed suite in the student's residence hall was also finished, and the hall remained open.

The incident involved a graduate student who claimed to have synthesized dimethyl mercury, an unauthorized compound, in a chemistry laboratory. Emerging information questioned whether the synthesis occurred. The student, under medical supervision, had an initial blood test showing no sign of mercury exposure. Building 18 remained closed through Sunday for decontamination, and high-touch surfaces in the residence hall common areas were cleaned. Baseline testing was offered to individuals in proximity to the student's work environment on August 26th, with a low risk of secondary exposure deemed likely by officials.

Building 18 remained closed on August 28th for decontamination. The incident was considered localized to one student who had unauthorized use of the material. The risk of secondary or tertiary exposures was assessed as low.

Building 18 was closed on August 27th as a precaution after an individual reported exposure to a hazardous material in a second-floor laboratory. Cleanup was underway, and occupants would be notified upon reopening. An investigation was ongoing, and support resources were made available to the MIT community.

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