Jane's Defence Weekly reports that the Dolphin-class submarines are believed to be nuclear armed, offering Israel a sea-based, second strike capability. In adherence to Missile Technology Control Regime rules the US Clinton administration rejected an Israeli request in 2000 to purchase Tomahawk long range SLCMs. The U.S. Navy has deployed nuclear armed and conventional Tomahawk missiles for its submarine fleet which are launched from standard heavy 533 mm torpedo tubes. The Federation of American Scientists and GlobalSecurity.org report that the four larger torpedo tubes are capable of launching Israeli built nuclear-armed Popeye Turbo cruise missiles (a variant of the Popeye standoff missile), and the U.S. Navy recorded an Israeli submarine-launched cruise missile test in the Indian Ocean ranging . The Dolphin class uses the ISUS 90-1 TCS weapon control system supplied by STN Atlas Elektronik, for automatic sensor management, fire control, navigation, and operations. The installed radar warning receiver is a 4CH(V)2 Timnex electronic support measures system, scanning from 5GHz to 20GHz frequency bands and able to pinpoint radar sites with accuracy between 5 and 10 degrees of angle (depending on frequency). The surface search radar is an Elta unit operating on I band. The sonar suite includes the advanced Atlas Elektronik CSU 90 hull-mounted passive and active search and attack sonar. The PRS-3 passive ranging sonar is also supplied by Atlas Elektronik, the flank array is a FAS-3 passive search sonar. A notable design feature is the prismatic hull cross-section and smoothly faired transitions from the hull to the sail, improving the boat's stealth characteristics. The ship and internal features are constructed of nonmagnetic materials, significantly reducing the chances of it being detected by magnetometers or setting off magnetic naval mines. The submarines have two Kollmorgen periscopes. The Dolphins can mount an external special forces hangar aft of their sail. The Dolphins are equipped with three V-16 396 SE 84 diesel engines built by MTU Friedrichshafen (now Tognum), developing sustained power. The submarines are equipped with three Siemens 750kW alternators, and a Siemens 2.85MW sustained-power motor driving a single shaft. The propulsion system provides a speed of submerged and a snorkeling speed of . The hull is rated for dives up to . The maximum unrefuelled range is traveling on the surface at and over at submerged; they are designed to remain unsupplied for up to 30 days on station. Operational service According to news reports the submarines are