THE Royal Navy’s entire fleet of attack submarines is currently out of action.

Repairs and maintenance to all seven have left none to defend our waters — or monitor Russia’s relentless probes.

4 All seven of the subs are out of action

But it has been kept from PM Theresa May because defence chiefs fear her reaction.

Sources say the Navy’s three new Astute class subs, costing £1.2billion each, are beset by problems.

And the four remaining Trafalgars are said to be “on their last legs”.

4 Credit: EPA

Theresa May hasn't been told about the Navy situation

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Five of the fleet, including one of the new type, are having refits or maintenance after breaking down.

Another new one, HMS Ambush, is being repaired after crashing into a tanker near Gibraltar last year.

Only one, HMS Astute, is at sea but she is having trials following maintenance and is weeks from missions.

4 HMS Astute is the only sub that's at sea Credit: Getty Images

Vanguard nuclear deterrent subs remain operational but it is believed to be the first time in decades the UK has had no attack subs ready.

It means there are none to patrol vital trade routes under constant threat from closure by Iran.

4 HMS Ambush is out of action after a crash Credit: PA:Press Association

And there are none to check probes by Russian subs in the North Atlantic.

Ex-PM David Cameron apparently flew into a rage when told there were no subs for Med patrol in 2014.

And a Whitehall source, said: “No one is being honest about the scandal.”

The problem-hit Astute class slowly replacing the Trafalgars is built by BAE Systems, along with Type 45 Destroyers which break down in hot weather.

The news comes a day after RAF fighters had to monitor Russian bombers menacing UK airspace.