Dredging cost hits £60m
The work to deepen the harbour has been going on for more than a year and is almost complete.
Once finished, it will be able to accommodate the two 65,000-tonne Queen Elizabeth-class aircraft carriers for the duration of the life.
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Hide AdThe details of the costs were confirmed by defence minister Harriett Baldwin following a question by Scottish National Party MP Douglas Chapman.
The project forms part of the overall £100m scheme to revamp the city’s naval base ahead of the arrival of the carriers, HMS Queen Elizabeth and HMS Prince of Wales.
Queen Elizabeth is due to arrive in Portsmouth by the end of the year.