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In 2009, when I was this paper’s military correspondent, I was invited one day by the IDF to sail aboard one of the navy’s Dolphin-class submarines. It was a rare invitation – in the preceding decade, only two journalists had been afforded the opportunity.We sailed out of Haifa and spent time floating 300 meters below the choppy Mediterranean for a routine training exercise. I spent just a few hours aboard the vessel, but it was enough to walk away impressed by the submarine’s capabilities.Israel’s submarines are the country’s most expensive and most strategic military platform. According to some reports, the Dolphins are Israel’s second-strike capability, meaning that if the country is attacked by nuclear weapons, its submarines would be able to retaliate with nuclear-tipped cruise missiles of their own.Whether this is true or not, the submarines are primarily of strategic significance, since they have the ability to go places without anyone knowing they are there. “The fact that you don’t know where it is and what it is doing, without a doubt strengthens Israeli deterrence,” the commander of Flotilla 7, which operates the submarines, told me at the time.Today, Israel has five submarines with a sixth to be delivered in 2018. Last week, Germany’s National Security Council reportedly approved the sale of another three submarines to replace the original three which have been operational since 2000.The arrests this week of a number of officials who were involved in the most recent submarine deal is not just another case of alleged corruption. This hits at the core of what is supposed to be Israel’s holy of holies: the IDF and the procurement of its most sensitive and strategic weaponry.Three men stand out in the investigation. The first is David Shimron, the attorney who represented Miki Ganor, the representative of the German shipyard ThyssenKrupp which builds the submarines.Shimron is not just Prime Minister Benjamin Netanyahu’s relative, he is his private attorney. There is almost nothing political that the prime minister does without going through Shimron. Every coalition agreement signed in recent years by Netanyahu was negotiated by Shimron. If you are a member of Netanyahu’s coalition, then you have Shimron’s phone number in your contacts.Next is Adm. (res.) Eliezer Marom, former commander of the Israel Navy, who is reportedly suspected of receiving a bribe to advance the deal.There is also V.-Adm. (res.) Avriel Bar-Yosef, whom Netanyahu had appointed to serve as his national security adviser, but had to withdraw his candidacy due to suspicions against him.Imagine tomorrow that the Defense Ministry goes to the Pentagon and inquires about the purchase of an advanced fighter jet, or follows up on the talks recently held in Jerusalem with Indian Prime Minister Narendra Modi and looks to advance new arms deals. Can they be relied on? Will the fear of corruption turn Israel’s foreign partners away?This investigation has ramifications way beyond this specific submarine deal, or whether the investigation eventually somehow drags in Netanyahu. It is imperative that the police complete it as fast as possible. Justice is important, but so is the need for the defense establishment to be able to operate without a dark cloud hanging over its head.