The Indonesian Navy said the Kri Nanggala submarine could have a phenomenon of "internal waves" in the seabed and suddenly pulled to the bottom.

The difference in the separate volume of seawater between the offshore area of Bali and the nearby Lombok Strait may have created a large underground wave strong enough to pull the Kri Nanggala submarine to the seabed in seconds, seniors

This phenomenon is also known as "internal waves", appearing in the seabed instead of the surface.

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"Internal waves" often appear in the South China Sea with a large size, forming a group, lasting hundreds of kilometers with a wavelength of up to dozens of kilometers, according to the US Navy Navy Global Hai Duong Study.

Standard Admiral Iwan Isnurwanto, Principal of the Counseling Office and the Navy Commander, Saying the Lady Satellite Himawari 8 of Japan to capture the image showing the sign of "internal waves" in the area around the submarine of Nanggala when

"The crew doesn't have time to do anything if the submarine has such an interior waves pull down. The submarine can suddenly fall down, making the sailor falling on a corner", standard Admiral Isnurwanto said

Indonesia's Kri Nanggala submarine moved near Harbor in Cilegon, Banten, October 2017.

With a strong water flow down, internal waves are considered a major threat to maritime and submarine works.

Naval officials Indonesia said it would have to conduct more surveys to detect internal waves in waters off the water, to avoid similar incidents with future submarines.

The Indonesian Naval official rejected a number of hypotheses about the cause of the nungala submarine in distress, including poor maintenance, the fault of the crew, and denied the rumors unfounded on social networks that this battleship

They said they would not make final conclusions about the cause of the incident until the salvage was confused by the submarine, but this process could take a lot of time.

Kri Nanggala has a number of 402, which is one of two Cakra class submarines, Type 209/1300 variant, made by Germany with a capacity of 1,400 tons of water when diving.

Submarine position Kri Nanggala.

Muhammad Ali, Assistant to Chief of Staff Indonesia, said Nanggala submarine was checked regularly, closest to the end of 2020. Experts evaluating cygala afford to arrange patrol to the end of September 2022

Ali affirmed that the entire crew on Nanggala is well trained and the ship does not carry overloads.

"The rumor said that Nanggala was sunk by foreign ships," Ali said.

The last time Nanggala contacted the headquarters on 3 hours on April 21 to ask for a diving to dive into the sea, then lost contact from 4:30.

The Indonesian Navy with the support of Singapore's MV SWIFT Rescue Submarine Submarine on April 25 detects many large fragments at a depth of 840 m.