GÖKDENİZ: The Last-Ditch Shield Protecting Turkish Warships From Supersonic Missiles

When an anti-ship missile has defeated every outer layer of a ship’s defences and is closing at supersonic speed, the crew has seconds and one final line left. On Turkish warships, that line is called GÖKDENİZ — ASELSAN’s close-in weapon system, which weaves a curtain of 35 mm fragmenting shells across the missile’s path and shreds it before it reaches the hull.

GÖKDENİZ is a close-in weapon system (CIWS) — the rapid-fire gun that forms the last link in a ship’s air-defence chain. ASELSAN developed it on the foundation of its land-based KORKUT anti-aircraft system, and it is built to destroy the anti-ship missiles and aerial threats targeting the vessel that carries it, out to an effective range of four kilometres. Its lethality rests on a special munition: the ATOM airburst round.

The ATOM round: a cloud of fragments

GÖKDENİZ’s power lies in ASELSAN’s 35 mm ATOM particle ammunition. Rather than trying to score a direct hit on a small, fast target, each round detonates at a computed point along the threat’s flight path, scattering a cloud of sub-projectiles in its way. The incoming missile need only fly through that cloud to be destroyed or knocked off course. By building a wall of metal in the air instead of aiming a single shell, the system raises intercept probability to levels conventional guns cannot reach.

Key specifications

Two munitions, ready at once

GÖKDENİZ uses an automatic belt-less ammunition feed that allows two ammunition types to be loaded at the same time: ATOM airburst rounds for missiles and precise targets, and conventional high-explosive incendiary (HEI) rounds for boats and larger threats. The system selects the appropriate round for the target type in a fraction of a second, switching from anti-missile shield to multi-purpose naval gun with no human intervention.

An independent brain and a 3-D eye

The GÖKDENİZ 100/35StA variant carries its own 3-D search radar, letting the mount detect, track and engage threats with full autonomy even if the ship’s other sensors are degraded. In normal operation it works in full integration with the ship’s combat management system, drawing targets from the wider sensor network — but its standalone capability makes it the last system to surrender when things go wrong.

Why it matters

The war in Ukraine and the Red Sea attacks have reminded navies of a hard truth: anti-ship missiles and kamikaze drones are now within reach of states and militias alike, and any ship without an effective close-in defence is a target waiting its turn. With GÖKDENİZ, ASELSAN gives Turkish warships a guard that never blinks — turning the final four kilometres before the hull into a kill zone for any incoming missile, and handing crews the one thing that matters most at sea: a second chance.