The military submarine KRI Nanggala-402, with 53 crew members, has been missing since last Wednesday, when it lost contact during maneuvers of training in the north of the island of Bali, in Indonesia.

The submersible was manufactured Germany in 1977 and was modernized in 2012. He disappeared shortly after receiving authorization to dive in deeper waters.

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According to navy from Indonesia, an oil spill found near where the submarine dived could point to damage to the fuel tank, or it could also be a signal from the crew.

Six warships, a helicopter and 400 people are involved in the search for help from Singapore, Malaysia, Australia, the United States, France and Germany.

You may be wondering, why is it so hard to find? Well, military submarines are built with "stealth" technology to cross the oceans in the most undetectable way possible. They emit almost no noise or heat and reflect radar and sonar impulses as little as possible. All of this makes searching even more difficult ...

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