According to a tweet published by the Greek Minister of Defence and a tweet published by Dimitris Mitch on April 16, 2021, the Ambassador of the Netherlands in Greece presented their proposal regarding the new multi-role frigate for the Hellenic Navy.
The Sigma class is a Dutch-built family of modular naval vessels, of either corvette or frigate size, designed by Damen Group.
At the heart of the Sigma-class design is a modular approach – the vessel can be built to suit the needs of a particular customer and the end-product can cover such types as fast-attack corvette, standard ocean-going corvette, off-shore patrol vessel, or basic frigate fighting forms. Inherent stealth features include an enclosed, low-profile smoke funnel, enclosed/integrated main mast, and slab-sided hull superstructure.
A turreted deck gun is set over the forecastle in the “A” position. Aft of this is a stepped hull superstructure which runs up to the integrated bridge section which hosts the integrated main mast mounting various communications and sensor fits. Beyond this is a collection of Surface-to-Air Missile (SAM) launchers and, aft of these installations, is the low-profile smoke funnel arrangement over midships. The aft section of the superstructure can accommodate a full-service helicopter hangar to go along with the stern-based helicopter pad (servicing a single navalized helicopter aircraft).
Armament includes the 76mm OTO-Melara turreted deck gun, 2 x 20mm Denel GI-2 (GIAT M693/F2) autocannons, 2 x MBDA Mistral TETRAL surface-to-air quad missile launchers, 4 x MBDA Exocet MM.40 Block II anti-ship missiles and 2 x Triple torpedo tubes supporting the EuroTorp 3A244S Model II/MU-90 torpedo families.