OVERVIEW: The 401 Cakra [Type 209-1300] is a diesel-electric attack submarine operated by the Indonesian Navy. Commissioned in 2007, the Cakra represents a modernised variant of the Type 209 family, a widely exported and highly successful submarine design from Howaldtswerke-Deutsche Werft (HDW). The Type 209-1300 variant offers a balance of capability, affordability, and ease of maintenance, making it a suitable platform for littoral and blue-water operations.

DETAILS: The Type 209 design emerged from the need for a capable yet cost-effective submarine to equip the navies of nations unable to afford more complex nuclear-powered vessels. HDW’s Type 209 series has undergone continuous development and modernisation since its inception, with the Type 209-1300 representing a significant upgrade over earlier variants. The design emphasizes reliability, acoustic stealth, and ease of operation. While the basic hull form retains the classic cigar shape associated with the Type 209 family, internal arrangements and sensor suites have been substantially improved in the 1300 variant. The Cakra, as an Indonesian example, reflects the country's strategic focus on maritime security within the Indonesian archipelago. Modernization programs during refits have ensured the platform remains a relevant asset, enhancing its sensor capabilities and combat systems.

The primary roles of the 401 Cakra are anti-submarine warfare (ASW), anti-surface warfare (ASuW), and intelligence gathering. In an ASW role, the submarine utilizes its active/passive sonar suite, including the advanced LOPAS 8300 low-frequency passive sonar (likely a Kongsberg Maritime system) for long-range detection of enemy submarines. The Generic Acoustic Intercept system further enhances its situational awareness by identifying and classifying underwater contacts based on their acoustic signatures. For ASuW engagements, the 401 Cakra relies on its periscope suite, consisting of the OMS 100 / SERO 400, which offers visual and electronic observation capabilities. The Generic Surface Search Radar provides surface contact detection and tracking, allowing the submarine to engage surface targets effectively. The Generic ESM (Electronic Support Measures) system [Advanced] provides crucial signals intelligence capabilities, enabling the vessel to identify and classify radar emissions from surface vessels and aircraft.

The 401 Cakra's operational effectiveness is significantly enhanced by its integrated sensor suite. The LOPAS 8300 sonar provides long-range detection capabilities, crucial for maintaining situational awareness in a complex maritime environment. The combination of active and passive sonar systems allows for both covert surveillance and active targeting of enemy submarines. The Generic ESM system enables the submarine to identify potential threats from a considerable distance, providing valuable early warning. The SERO 400 periscope, integrated with the OMS 100 optronic mast, offers advanced visual and electronic observation capabilities, essential for both surveillance and targeting. The armament of 533mm torpedo tubes allows for the deployment of a variety of modern torpedoes and potentially anti-ship missiles, enhancing its offensive capabilities against both surface and subsurface targets.

SPECIFICATION: Length: 59.5 m || Beam: 6.2 m || Draft: 5.5 m || Disp: 1265 t

SENSORS: Generic Surface Search Radar || Generic ESM [Advanced] || Generic Acoustic Intercept || Generic Active/Passive Attack Sonar || LOPAS 8300 [KE 9] || OMS 100 / SERO 400 Periscope Suite

ARMAMENT: 533mm TT