In the strategically important Strait of Hormuz, through which a significant portion of the world's oil passes, tension remains constant. While international attention focuses on large warships, Iran is developing a so‑called "mosquito fleet" — an unconventional force of high‑speed boats and drones capable of changing the rules of the game in the region. This tactic represents a serious threat with consequences that are difficult to predict.
The Iranian fleet consists of hundreds of small high‑speed boats capable of exceeding 185 km/h, and inexpensive drones. They are designed to operate in narrow waters where large ships cannot maneuver. Instead of conventional naval tactics, Iranian forces employ an approach reminiscent of "maritime guerrilla warfare," based on rapid attacks and wearing down the enemy. As retired Admiral Gary Roughead noted, this fleet remains an "undermining force" whose plans and intentions are hard to predict.
Modern Iranian tactics were shaped by lessons from the Iran–Iraq War of the 1980s, when Tehran realized it could not confront the U.S. Navy in open battle. Iran shifted to a strategy of pursuit and attrition rather than conventional engagements, focusing on asymmetric and mobile attacks. Expert Said Jolkar confirms that "the IRGC Navy operates more like a gang at sea... it focuses on unequal warfare, relying on quick strikes instead of classic naval battles."
To support this fleet, Iran has built at least 10 fortified bases hidden in deep caves dug into the rocky coastline. These bases make it extremely difficult to eliminate capabilities with air strikes and provide refuge for boats and drones. Analyst Farzin Nadimi notes that "the IRGC Navy has always considered itself on the front line of confrontation with the 'Great Satan' (the U.S.)," which explains the hardline combat doctrine of its roughly 50,000 fighters.
Merchant ships are the most vulnerable to attack because they lack effective defenses against small boats and drones. Even U.S. warships avoid prolonged presence in the strait due to its narrowness and the speed of threats. Cheap drones can shift the balance of power — a "low‑cost drone" can damage a destroyer worth billions of dollars, pushing American ships to remain in the Arabian Sea and the Gulf of Oman, out of range. This "invisible fleet" shows that U.S. military superiority is not an absolute victory, and Iran still possesses effective tools to disrupt one of the world's most important sea lanes at low cost and high impact.
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What is the organizational structure and chain of command between the regular Iranian Navy and the Islamic Revolutionary Guard Corps (IRGC) Navy, and how does this affect operations in the Strait of Hormuz? - Iran has two separate naval structures: the Navy of the Army (regular navy) and the IRGC Navy. Both report to the Joint Staff of the Armed Forces, which in turn is accountable to the Supreme Leader. In practice there is a division of responsibilities: the IRGC Navy predominantly handles operations in the Persian Gulf and the Strait of Hormuz using asymmetric tactics, while the regular navy is more focused on operations in the Gulf of Oman and the open ocean. This split allows Iran to employ different tactics effectively in the narrow strait, where the IRGC’s small fast boats have an advantage, but it can create difficulties in coordinating joint operations.
What specific types of high‑speed boats and drones make up the core of Iran’s "mosquito fleet," and how much of this equipment is domestically produced versus modified foreign technology? - The core of Iran’s "mosquito fleet" includes fast attack boats such as the Tondar and Peykan, equipped with missiles, as well as unmanned attack boats like Shahid. Among sea drones, strike UAVs such as the Shahed‑136 (also known as Geran‑2) and reconnaissance models stand out. Much of this equipment is produced domestically by Iran’s defense industry, but many systems were originally based on foreign technologies (for example Chinese or North Korean) that have been adapted, upgraded, and localized over recent decades, especially after international sanctions were imposed.
How have the geographic features of Iran’s rocky coast along the Strait of Hormuz influenced the choice of sites for these hidden cave bases, and how vulnerable are they to modern reconnaissance systems? - The rocky coastline formed by the Zagros mountain foothills provides natural caves and opportunities to create artificial underground facilities. This allows bases, ammunition depots, and shelters for boats to be masked from satellite observation and aerial reconnaissance. While such bases are resilient to conventional strikes due to the thickness of the rock, modern reconnaissance systems (synthetic aperture radar satellites, signals intelligence, maritime activity monitoring) can detect signs of their use, such as vessel movement on approaches or thermal signatures. Therefore, their concealment is not absolute, but it significantly complicates an adversary’s task of detection and precise targeting.
Full version: لماذا يمثل "أسطول البعوض" الإيراني تهديدا خطيرا في مضيق هرمز؟