Israel is not backing off of its line (and wisely so) to not give Iran any leeway to make a nuclear weapon. Their latest submarine addition?
“The submarine, the INS Tanin (in English, “Crocodile”) is one of five acquired from Germany in the past two decades.”
“According to foreign reports, cruise missiles aboard the vessels have a range of close to 1,000 miles and can carry nuclear warheads. Capable of extended stays at sea, one or more of submarines would likely always be within range of Iran.”