Jean-Pierre Misson, a Belgian amateur diver, said he identified in the wrecks while conducting scans of the Mediterranean.
It is thought that the wreckage is also home to more than 250 dead British submariners.
Mr Misson came across the wreckage of what appears to be seven submarines when conducting sonar scans of the seabed in an area between Tabarka and Cape Negro.
The diver, who is 78 years-old, said that by measuring the lengths and shape of the wrecks he has identified three T-class submarines, two U-class and one S-class submarine, all of them, Royal Navy vessels.
He said there also appeared to be one Italian class 600 submarine.
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The diver believes that the wrecks could be those of HMS Talisman, Tigris, Turbulent, Utmost, Usurper or P48, and P222.
Mr Misson told The Times: “They are all resting on the seafloor of what had been a naval mine barrage.
“There could be more wrecks, I have not sonar-explored the whole area. But to find the real identity of every submarine a visual approach is needed, which I don’t have the ability to do at my age and at that depth.”
Mr Misson, whose father was a captain in the British 8th Army during the war, went on to say that he suspects the vessels had been sunk after striking mines.
However, the fins that carried each vessel’s name seem to be still intact.
The amateur diver said he reported his findings to Tunisian, Italian and British authorities.
The Italians have told the Belgian that they will send a navy sonar and diving team to identify the suspected Italian submarine.
However, Mr Mission added: “With six submarines, the British have not moved, yet.”
The Royal Navy said: “Given the amount of vessels lost during the war . . . and our position of not disturbing such sites, we are often in a position where we cannot be certain of the identity of such wrecks.”
The Royal Navy lost a total of 76 submarines during the war, 32 per cent of the entire fleet.