Dolphin class

German-built diesel-electric attack submarines of the Israeli Navy, combining fuel-cell air-independent propulsion, special-forces accommodations, and a widely reported — but officially unconfirmed — sea-based nuclear second-strike role.

Overview

The Dolphin class is the backbone of Israel’s submarine flotilla, comprising three conventionally powered Dolphin I boats (commissioned 1999–2000) and three longer, air-independent propulsion (AIP)-equipped Dolphin II boats (2014–2026). Built by Howaldtswerke-Deutsche Werft (HDW, now part of ThyssenKrupp Marine Systems) in Kiel, the six-boat force is unique among Western operators for its oversized 650 mm torpedo tubes and the analytical near-consensus that it carries nuclear-capable Popeye Turbo submarine-launched cruise missiles, giving Israel a survivable second-strike capability. Israel neither confirms nor denies that assessment, and virtually all operational activity is classified. What is publicly known — a 2000 cruise-missile test off Sri Lanka observed by the U.S. Navy, and a 2026 IDF disclosure that a Dolphin operated at its farthest range ever while submarines were simultaneously in three arenas — is detailed below.

Development

Planning for a new Israeli submarine began in the late 1980s, but an initial 1990 order was cancelled and later revived under a compensation-era agreement with Germany. Berlin donated the first two Dolphin I boats and split the cost of the third, a pattern of generous German co-funding that has persisted across every batch. The three Dolphin I units — INS Dolphin, INS Leviathan and INS Tekumah — were commissioned between May 1999 and 2000 and replaced the aging Gal class. A second batch (Dolphin II) was agreed in 2006, incorporating a roughly 10 m hull extension to accommodate an HDW fuel-cell AIP system, enlarging submerged displacement to approximately 2,400 tonnes. INS Tanin entered service in 2014 and INS Rahav in 2016; the final boat, INS Drakon, was launched at Kiel on 12 November 2024 and is expected to reach Israel in summer 2026. Construction of the successor Dakar class — a “completely new design” also funded partly by Germany — began the same day, with the €3 billion contract signed on 20 January 2022 under the shadow of Israel’s Case 3000 corruption investigation.

Design & capabilities

The Dolphin design is enlarged from the HDW Type 209 export submarine family, built with a non-magnetic steel hull to reduce detectability. Propulsion comes from three MTU 16V 396 SE 84 diesels (total ~3.12 MW), three Siemens alternators and a single Siemens 2.85 MW electric motor driving one shaft; the Dolphin II adds a fuel-cell AIP module that enables submerged endurance of week-plus periods without snorkelling. NTI reports a submerged range figure of approximately 4,500 km for the AIP boats.

The boat carries ten torpedo tubes — six standard 533 mm and four oversized 650 mm — with capacity for up to 16 weapons. Those weapons include DM2A3/DM2A4 SeaHake heavyweight torpedoes, mines and swimmer delivery vehicles, but the 650 mm tubes have drawn the most external scrutiny. According to the Federation of American Scientists and Jane’s, they are assessed to launch the Popeye Turbo submarine-launched cruise missile, with a range of at least 1,500 km and a potential 200 kt nuclear warhead — an attribution Israel has never confirmed.

Sensors and combat management are provided by Atlas Elektronik: the ISUS 90 combat system, CSU 90 hull sonar, PRS-3 passive ranging sonar and FAS-3 flank array, complemented by Timnex 4CH(V)2 ESM and an Elta I-band surface-search radar. Two Kollmorgen periscopes are fitted. A wet-and-dry compartment behind the sail can embark special forces and an external hangar can be mounted aft.

The final Dolphin II, Drakon, appeared with a dramatically enlarged sail, prompting open-source speculation that it houses a vertical launch system for new missiles — possibly cruise or even ballistic — making it the first modern submarine to carry such missiles in the sail. Analysts at The War Zone assessed that the sail change points toward a step-change in the boat’s reported deterrent role, though no official source has commented.

Variants

• Dolphin I — Three boats (1999–2000); conventional diesel-electric propulsion, 57.3 m length, ~1,900 t submerged.
• Dolphin II (Dolphin AIP) — Three boats (2014–2026); lengthened to ~68.6 m for fuel-cell AIP, ~2,400 t submerged; Drakon, the last, incorporates the enlarged sail that has triggered VLS speculation.
• Dakar class — A separate, follow-on design of three boats (contract signed 2022) intended to replace the Dolphin I unit from the early 2030s; not a Dolphin variant.

Combat record / operational use

Israel keeps submarine operations almost entirely classified. The foundational public-source event is a May 2000 cruise-missile test in the Indian Ocean off Sri Lanka that, according to former U.S. officials cited by FAS and NTI, saw Dolphin-class boats fire missiles to a range of roughly 1,500 km — an event observed by the U.S. Navy and the basis for the enduring nuclear-second-strike attribution. Jane’s Defence Weekly and Der Spiegel reinforced that assessment in subsequent years, though Israel has never acknowledged the test or the weapons.

In the 2023–26 war period the operational veil lifted slightly. Israeli media reported Dolphin-class submarines deploying to the Red Sea alongside corvettes against the Houthis (see Sa’ar dossier). In April 2026 the IDF disclosed that during the war with Iran a Dolphin-class boat operated at the farthest distance from Israel in the flotilla’s history, with submarines simultaneously active in three arenas “thousands of kilometres” apart; the same disclosure confirmed an unprecedented Shayetet 13 commando operation at a range that precluded extraction. No specific submarine strike or launch in the Iran or Yemen campaigns has been officially confirmed.

Advantages

• Extreme quiet and endurance: Fuel-cell AIP on Dolphin II allows submerged periods of week-plus durations without snorkelling; non-magnetic hull and streamlined sail reduce acoustic and magnetic signatures.
• Credible second-strike deterrence: The widely attributed pairing of 650 mm tubes and Popeye Turbo SLCMs (range ≥1,500 km, nuclear-capable) gives Israel a survivable retaliatory option, a role reinforced by the 2000 Indian Ocean test.
• Flexible payload: Ten tubes (6 × 533 mm, 4 × 650 mm) can carry heavyweight torpedoes, mines, swimmer delivery vehicles and the claimed cruise missiles, plus a dedicated wet-and-dry compartment for special forces.
• Long-range operational reach: The 2026 IDF statement confirmed the boats can operate at unprecedented distances and in multiple theatres simultaneously.
• Sustained German co-funding: Berlin has donated or underwritten a large share of every batch, making a six-boat force economically viable for Israel.

Drawbacks / limitations

• Peak cost platforms: Unit costs have risen sharply — from roughly $1.17 billion for the Tanin/Rahav pair (2005 est.) to €3 billion for three Dakar boats (2022), with negotiation overruns doubling Dakar’s price.
• Aging first batch: The three Dolphin I boats of 1999–2000 vintage will not be replaced until the early 2030s, stretching maintenance and operational demands.
• Programme integrity damaged: Case 3000, Israel’s submarine procurement corruption scandal, resulted in multiple indictments and a state commission of inquiry, clouding the programme’s transparency.
• Small force size: Only 2–3 AIP boats until Drakon’s arrival, limiting concurrent coverage of the Mediterranean, Red Sea and distant patrol stations.
• Verifiability gap: Key capabilities — including the VLS assessment for Drakon and the nuclear nature of the Popeye Turbo — rest entirely on open-source speculation and attributed defence sources, not official data.

Counterparts

• Type 212 (Germany)
• Improved Kilo (Russia)

Outlook

The Dolphin class is entering a decisive transition. Drakon’s delivery in summer 2026 will restore the flotilla to six boats and, if the sail-missile assessments are correct, represent a step-change in at-sea deterrence. At the same time, construction of the first Dakar has begun in Kiel, scheduled to replace the Dolphin I boats from the early 2030s. The Israeli Navy’s 2026 multi-year plan explicitly calls for expanding “long-range, lethal, and decisive capabilities, both overt and covert” — a goal the Dolphin/Dakar lineage is engineered to deliver, even as the technical details remain behind a wall of official silence.

Key specifications

Sources

1. Wikipedia — Dolphin-class submarine — https://en.wikipedia.org/wiki/Dolphin-class_submarine
2. Naval News — German Shipbuilder TKMS Hits Two Milestones with Israel’s Submarine Programs — https://www.navalnews.com/naval-news/2024/11/german-shipbuilder-tkms-hits-two-milestones-with-israels-submarine-programs/
3. Naval News — Israel’s Submarine Secret: New Dolphin-IIs Could Have VLS — https://www.navalnews.com/naval-news/2022/01/israels-submarine-secret-new-dolphin-class-boat-could-have-vls/
4. Naval News — Israel Launches New Submarine, First In World With Modern Missiles In Sail — https://www.navalnews.com/naval-news/2023/08/israel-launches-new-submarine-first-in-world-with-modern-missiles-in-sail/
5. The War Zone — Latest Israeli Submarine’s Big Sail Seen In New Images — https://www.twz.com/new-israeli-submarines-big-sail-seen-in-images
6. Times of Israel — Israel signs scandal-ridden €3 billion deal with Germany to buy new submarines — https://www.timesofisrael.com/israel-signs-scandal-ridden-e3-billion-deal-with-germany-to-buy-new-submarines/
7. Times of Israel — Navy says commandos conducted unprecedented op amid war, thousands of kilometers away — https://www.timesofisrael.com/navy-says-commandos-conducted-unprecedented-op-amid-war-thousands-of-kilometers-away/
8. Defense News — Israel inks $3.4 billion submarine deal with Germany — https://www.defensenews.com/naval/2022/01/20/israel-inks-34-billion-submarine-deal-with-germany/
9. Nuclear Threat Initiative — Israel Submarine Capabilities — https://www.nti.org/analysis/articles/israel-submarine-capabilities/
10. Federation of American Scientists — Popeye Turbo — https://nuke.fas.org/guide/israel/missile/popeye-t.htm
11. Seaforces.org — Dolphin class Submarine — https://www.seaforces.org/marint/Israeli-Navy/Dolphin-class-Submarine.htm

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