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3d ago

Communications Wire Failure Halts MBTA Blue Line Under Boston Harbor

MBTA crews are repairing a fallen communications wire beneath the harbor to resume full Blue Line service.

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Three still images of people in a Blue Line subway tunnel in Boston from video shared with NBC10 Boston on Tuesday, July 15, 2025.
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Overview

  • A downed communications wire was found around 2:30 p.m. Tuesday between Aquarium and Maverick stations, halting service under the harbor.
  • Boston firefighters, MBTA transit police and staff evacuated about 465 passengers through emergency hatches in an hour without any injuries.
  • Shuttle buses between Government Center and the Airport, plus the SL3 bus route and the East Boston ferry, are covering the disabled Blue Line segment.
  • MBTA crews are on site replacing the broken wire and plan to run a test train before resuming full operations.
  • Officials are investigating the wire failure as Tuesday’s fatal track incident and a long-standing maintenance backlog renew public pressure for MBTA upgrades.