the nearest town in its path, which was Coober Pedy, away. Some observers were surprised that the detonation seemed to be silent; the sound wave arrived a few seconds later. The yield was estimated at . The cloud rose to , much higher than expected. After about eight minutes, a Canberra bomber flew through the cloud to collect samples. Along with a secondary cloud that formed between , it drifted eastward. The main cloud crossed the east coast at about 11:00 on 28 September, followed by the secondary between 12 and 18 hours later. Rain on 29 September deposited some fallout between Brisbane in Queensland and Lismore in New South Wales. Test 2: Marcoo The next test was Marcoo, a ground test using a Blue Danube device with a low-yield core. In the hope that sharing the results might lead to fuller cooperation, the test had been discussed with the Americans by the British Joint Staff Mission in Washington, D.C., and they had been sufficiently interested to offer the use of American instrumentation and personnel. Fearful of giving away too much information, the British accepted the instrumentation only. The weapon was lowered into a concrete pit. This time the weather was good, but the aircraft bringing Beale and the politicians was delayed by fog in Canberra. It arrived at Maralinga at 15:40, and they had to be rushed to the viewing platform on Observation hill. The bomb was detonated precisely on time, at 16:30, with a yield of . It left a crater wide and deep. The fallout crossed the east coast 25 to 30 hours after the detonation. Test 3: Kite Kite was an air drop using a Blue Danube device with a low-yield core, the only air drop conducted during Operation Buffalo. Originally the air drop was supposed to be the last test of Operation Buffalo, but after the Marcoo shot Penney decided to swap the last two tests, making the air drop the third test. The air drop was the most difficult test, as the worst-case scenario involved the radar fuses failing and the bomb detonating on impact with the ground, which would result in severe fallout. The RAF therefore conducted a series of practice drops with high explosive bombs. In the end, in view of the AWTSC's concerns about the dangers of a test, a low-yield Blue Danube core with less fissile material was substituted, reducing