Heroic Idun's ordeal began on August 8, when the tanker arrived as scheduled to take on a cargo from the CNOOC-operated Akpo offshore FPSO. As she waited, Heroic Idun was approached by the Nigerian Navy vessel Gongola. Fearing that the patrol boat was actually a pirate vessel, Heroic Idun fled into Equatorial Guinea's waters and reported an attempted act of piracy to the IMB's reporting center.

https://maritime-executive.com/article/nigeria-releases-crew-of-vlcc-heroic-idun-ending-nine-month-ordeal