“The Israeli defence ministry declined to comment.
Israel already has five of the state-of-the-art German submarines, with a sixth due for delivery in 2017, Maariv said.
Foreign military sources say the Dolphins can be equipped with missiles armed with nuclear warheads.
They say Israel has between 100 and 200 warheads and missiles capable of delivering them.
Israel is the Middle East’s sole if undeclared nuclear power, refusing to confirm or deny it has such weapons.”