A seawater flood deep under the Indian Ocean has crippled the Royal Australian Navy submarine HMAS Dechaineux. It cannot rise to the surface because it has taken on too much water. The 60 men and women on board are fighting to save the submarine and themselves from sinking to the ocean floor. They stabilise the boat briefly, but then, to their horror, it begins to sink further. Some think of their families, others put their arms around each other.

In Episode 3 we reveal how the crew confront their mortality while they fight to survive.     

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