Kri Langgala submarine is a variant of TYPE 209 produced by Germany, once the "most expensive Western" talent gas due to a cheap advantage.

Indonesia's Kri Nanggala submarine carrying 53 people missing from the early morning of April 21 while playing off Bali Island.

The ship seemed to have sinking to a depth of about 600-700 m, while it was only designed to operate at a depth of 250-500 m, causing many military experts to judge KRI Nanggala has been concluded in the seabed

The Indonesian Navy owns 5 submarines attacking diesel - electricity, including Kri Cakra and Kri Nanggala built by Germany, with three Chang Bogo classes produced by Korea.

Submarine Kri Nanggala moves off Java in 2015. Photo: Indonesian Navy.

The Type 209 class development process was launched by Germany in the context of many countries seeking solutions to replace backward submarines from World War II.

Type 209 was developed from the previous Type 206 series with more modern equipment, considered a "poor child" submarine model that combines small size, high performance, easy to use, suitable for

To save costs, ship apps design a crust.

Type 209 submarine can reach speeds of 21 km / h when floating or 42 km / h when diving.

5 versions developed by Germany include Type 209/1100, Type 209/120, Type 209/1300, Type 209/1400 and Type 209/1500, distinguished by full loading water when diving and accompanying equipment.

Kri Nanggala is one of two vessels of Cakra class, built on the type of Type 209/1300 variant.

60 m long, 6.2 m wide, with a volume of water 1,390 tons when diving and 33 crews.

The ship has 8 torpedo tubes of 533 mm and wears a maximum of 14 multi-purpose bullets, capable of killing both the target of water surface and enemy submarines.

Chang Bogo class submarine for Indonesia was developed from Type 209/1300.

Two Indonesia's Cakra class submarines experienced the great overhaul in Germany during the period 1986-1989, but the main maintenance cost made Jarkata abandoned the intention to buy two Type 209.

The Nanggala continues to experience the repair and upgrades in Korea in the period in the period of 2010-2012 to replace batteries and engines, as well as equipped with passive and managing hydrogen navigation systems and managers.