Nanggala lost contact shortly after the Indonesian Navy gave it permission to dive at 3:00 a.m. The
Nanggala was in the Bali Strait, a narrow waterway between the islands of Java and Bali. Here’s the Notice to Airmen (NOTAM) notifying civilian aviators of the torpedo exercise:
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Aerial searchers discovered an oil slick on the ocean in the vicinity of the sub’s last known location at 7 a.m. on Wednesday.