for safety and security reasons. That some of this was outside Australia's territorial waters attracted comment. The frigate was tasked with patrolling the prohibited area, while its sister ship acted as a weather ship. Logistical support was provided by , and Mildura, the motor water lighter MWL 251 and the motor refrigeration lighter MRL 252, and the tugboat , which towed a fuel barge. Dakotas of No. 86 Wing RAAF provided air patrols and a weekly courier run. Operation The main site, known as H1, was established on the south-east corner of Hermite Island. This was the location of the control room from which the bomb would be detonated, along with the equipment to monitor the firing circuits and telemetry. It was also the location of the generators that provided electric power and recharged the batteries of portable devices, and ultra-high-speed cameras operating at up to 8,000 frames per second. Other camera equipment was set up on Alpha Island and Northwest Island. Most of the monitoring equipment was positioned on Trimouille Island, closer to the explosion. Here, there were a plethora of blast, pressure and seismographic gauges. There were also some 200 empty fuel containers for measuring the blast, a technique that Penney had employed on Operation Crossroads. There were thermometers and calorimeters for measuring the flash, and samples of paints and fabrics for determining the effect on them. Plants would be studied to measure their uptake of fission products, particularly radioactive iodine and strontium. Stores were unloaded at beachhead H2 on Hermite Island, between Brandy Bay and Buttercup Island, whence the RAAF had built a road to H1. A stores compound was established at Gladstone Beach on Trimouille Island, known as T3. The original intention was that the scientists would stay on Campania, commuting to the islands each day, but the survey party had misjudged the tides; Campania could not enter the lagoon, and had to anchor in the Parting Pool. The pinnaces could not tie up alongside Campania at night, and had to be moored several miles away. Transferring to the boats in choppy waters was hazardous. One scientist fell in the sea and was rescued by Commander Douglas Bromley, Campanias executive officer. Rough seas prevented much work being done between 10 and 14 August. It took about an hour and a half to get from Campania to H2, and travelling between Plym and Campania took between two