The Giant Voice will be heard coming from the Portmouth Naval Shipyard on Tuesday and Wednesday.

It's not a new Marvel movie but rather the name of the recently updated public address loud speaker system that will be tested on Tuesday and Wednesday between 8 a.m and 5:30 p.m. each day.

There are three parts to the testing: all-call testing, individual testing, and intelligibility

    • All-call testing is the message at the beginning and end of the test period announcing to disregard or listen for additional information.
    • Individual testing consists of multiple transmissions at each speaker location lasting for approximately 30 seconds. It consists of tones and “test” messages.
    • Intelligibility testing will occur only at the newly installed speaker locations and use a white noise generator to transmit two tones for approximately one minute

No action is required by the public during the tests.

The test comes nearly three weeks after a false announcement ordering the evacuation of beaches was aired on 9 of 121 Seabrook Station sirens within the 10 mile zone around the nuclear plant.

NextEra Energy Seabrook Station told Gov. Chris Sununu in a letter that it is "conducting a thorough investigation and we will take actions to ensure this situation does not happen again." The company has not yet provided an explanation.

Contact reporter Dan Alexander at or via Twitter @DanAlexanderNH

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