The UK's biggest warship gushed water as the HMS Queen Elizabeth's onboard sprinkler system fired off accidentally.
The malfunction saw floods of water spraying out in one of the £3.1bn ship's main hangars, according to the Sun.
According to the newspaper's source, the flooding was "minor" and shut off within minutes.
Meanwhile Portsmouth's naval base tweeted to say the ship's departure for a two-month trials programme will not take place today.
The Ministry of Defence told the Standard however that the sailing had not been delayed as such but was always set to take place in a tidal window dependent on conditions.
"We are on track with the sea trials programme but we don't discuss the specifics of that," said a spokesman.
It came just a month after it was revealed the 280-metre warship was leaking due to a faulty seal in a propeller shaft.
With an estimated half-a-century working life, the Navy's future flagship is the biggest and most expensive ever built by the UK.
The aircraft carrier weighs 65,000 tonnes and has a top speed of more than 25 knots.
An array of ship-building yards around the country were involved in the build - these include Govan and Scotstoun in Glasgow, Appledore in Devon, Cammell Laird in Liverpool, A&P on the Tyne in Newcastle and Portsmouth.
HMS Queen Elizabeth commissioning ceremony - In pictures
Around 10,000 people worked on construction of the ship, made up in sections at yards around the UK and transported to Rosyth, Fife, where it was assembled.
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