Barrow is waiting for a vote in Parliament to decide its future as part of the UK's nuclear defence programme.
Almost 8,000 people work at the BAe plant in Cumbria - most of them on the Vanguard-class submarines which carry Trident nuclear missiles.
MPs will vote on whether the UK Government goes ahead with spending up to £50bn on a fleet of new subs codenamed Successor.
- Granada Reports correspondent Amy Welch looks at what the industry means to the region:
Construction work will begin on the successor submarines that carry the controversial Trident missiles, the Defence Secretary has said.
There's clear division over Britain's nuclear deterrent, which carries missiles as powerful as eight Hiroshima nuclear bombs.
MPs are set to vote on Monday evening whether or not to renew Britain's £40 billion Trident nuclear deterrent.