For Chinese submarines, the relevant routes into the Indian Ocean are the Malacca Strait, Sunda Strait and Lombok Strait. H I Sutton
Forbes: Chinese Navy Submarines Could Become A Reality In Indian OceanThe Chinese Navy is rapidly pursuing global capabilities. A key area of future operations may be the Indian Ocean. Chinese submarines in particular could have a strategic impact if they were roaming those waters. From China’s standpoint this would protect vital sea lanes which will be vulnerable in any war. Naturally many of the world’s navies would be concerned if this were the case. Chief among them is the Indian Navy which currently has the largest submarine fleet in the South Asia region.
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WNU Editor: The Chinese navy does have the facilities in the Indian Ocean to take care of its navy when it is in the Indian Ocean (see above image).