Operation Navy Help Darwin
[2] Four Attack-class patrol boats were based in Darwin; Advance and Assail were able to weather the cyclone with minor damage, but Attack was forced aground, and Arrow sank after colliding with Stokes Hill Wharf, killing two personnel and bringing the death toll to 65.[2] Flinders was tasked with surveying the harbour to work out the position of wrecks and the safest areas for the other RAN ships to anchor, while Brisbane established contact with the Emergency Services Organisation Committee running relief efforts in Darwin.[2] The initial RAN relief which was limited to search and rescue in the area of Darwin Harbour and Melville Island, which was hindered by the lack of reliable communications.[2] They cleared and restored 1,593 properties, along with schools and government buildings, disposed of spoiled food, installed generators, and repaired electrical networks.[2] During May and June 1975, the minehunters Curlew, Ibis, and Snipe undertook a detailed survey of Darwin Harbour to pinpoint all of the vessels sunk by the cyclone.