The Liberty ship SS E. A. Bryan docked at the inboard, landward side of Port Chicago's single 1,500 ft (460 m) pier at 8:15 a.m. on July 13, 1944. The ship arrived at the dock with empty cargo holds but was carrying a full load of 5,292 barrels (841,360 liters) of bunker C heavy fuel oil for its intended trip across the Pacific Ocean. At 10 a.m. that same day,[27] seamen from the ordnance battalion began loading the ship with munitions. After four days of around-the-clock loading, about 4,600 tons (4,173 tonnes)[27] of explosives had been stored in its holds. The ship was about 40% full by the evening of July 17.[citation needed]
At 10 p.m. on July 17, Division Three's 98 men were loading E. A. Bryan with 1,000-pound (450 kg) bombs into No. 3 hold, 40 mm shells into No. 5 hold and fragmentation cluster bombs into No. 4 hold.[28] Incendiary bombs were being loaded as well; these bombs weighed 650 lb (290 kg) each and were "live"—they had their fuzes installed. The incendiary bombs were being loaded carefully one at a time into No. 1 hold—the hold with a winch brake that might still have been inoperative.[28]
A boxcar delivery containing a new airborne anti-submarine depth charge design, the Mark 47 armed with 252 lb (114 kg) of torpex, was being loaded into No. 2 hold. The torpex charges were more sensitive than TNT to external shock and container dents.[29] On the pier, resting on three parallel rail spurs, were sixteen rail cars holding about 430 short tons (390 t) of explosives.[27] In all, the munitions on the pier and in the ship contained the equivalent of approximately 2,000 short tons (1,800 t) of TNT.[27]
At 10:18 p.m., witnesses reported hearing a noise described as "a metallic sound and rending timbers, such as made by a falling boom."[27] Immediately afterward, an explosion occurred on the pier and a fire started. Five to seven seconds later[17][31][32] a more powerful explosion took place as the majority of the ordnance within and near the SS E. A. Bryan detonated in a fireball seen for miles. An Army Air Forces pilot flying in the area reported that the fireball was 3 mi (4.8 km) in diameter.[32] Chunks of glowing hot metal and burning ordnance were flung over 12,000 ft (3,700 m) into the air.[17] The E. A. Bryan was completely destroyed and the Quinault was blown out of the water, torn into sections and thrown in several directions; the stern landed upside down in the water 500 ft (150 m) away. The Coast Guard fire boat CG-60014-F was thrown 600 ft (180 m) upriver, where it sank. The pier, along with its boxcars, locomotive, rails, cargo, and men, was blasted into pieces. Nearby boxcars—waiting within their revetments to be unloaded at midnight—were bent inward and crumpled by the force of the shock. The port's barracks and other buildings and much of the surrounding town were severely damaged. Shattered glass and a rain of jagged metal and undetonated munitions caused many more injuries among military personnel and civilians, although no one outside the immediate pier area was killed.[33] Nearly $9.9 million worth of damage ($145.5 million in 2020) was caused to U.S. government property.[34] Seismographs at the University of California, Berkeley sensed the two shock waves traveling through the ground, determining the second, larger event to be equivalent to an earthquake measuring 3.4 on the Richter magnitude scale.[35]
