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Originally Posted by Mr Quatro

How could this happen on the same day?

Two weeks later a Japanese submarine sank the USS Indianapolis ...



https://en.wikipedia.org/wiki/USS_Indianapolis_(CA-35)

https://en.wikipedia.org/wiki/Trinity_(nuclear_test) meets:

After major repairs and an overhaul, Indianapolis received orders to proceed to Tinian island, On 16 July 1945 the USS Indianapolis arrived at the Naval Weapons Center- Port Chicago, California and received a three foot diameter by four foot tall canister of top-secret cargo carrying parts and the enriched uranium. (about half of the world's supply of Uranium-235 at the time) for the atomic bomb Little Boy, which would later be dropped on Hiroshima. Four hours after the Trinity explosion, Indianapolis departed San Francisco's Hunters Point Naval Shipyard on 16 July 1945, within hours of the Trinity test. USS Indianapolis set a speed record of  74 1⁄2 hours with an average speed of 29 knots (54 km/h; 33 mph) from San Francisco to Pearl Harbor which still stands today. Arriving at Pearl Harbor on 19 July, she raced on unaccompanied, delivering the atomic weapon components to Tinian on 26 July. On July 28 and 29, four "Green Hornet" transports flew in from the U.S. with the plutonium pieces for Fat Man and the uranium inserts for Little Boy.

None of the crew knew what was contained in the crate and canister that were brought on board. The crate contained the “gun-type” mechanism for Little Boy. The uranium contained in the canisters was about half the US supply (the other half was flown to Tinian). It is unclear if McVay even knew what the contents were, though he claimed after the war that he did. He was, at least, aware of the secrecy and importance of his mission.
The two men who definitely did know were James Nolan and Robert Furman, two men from the Manhattan Project who accompanied the components to Tinian. The men were disguised as artillery officers, though it was not a very convincing cover. Furman, as an Army engineer, had some experience with artillery. But Nolan, a radiologist, raised some suspicion. He constantly had to return belowdecks to check the radiation from the canister, and was unable to answer basic questions about his supposed artillery experience.
Furman and Nolan were also probably the only ones who knew what caused the delay in launching the ship on the morning of July 16. In fact, they were waiting for a message about the result of the Trinity Test. With confirmation of that success, the Indianapolis left port. Actually J. Robert Oppenheimer believed that fifty atomic bombs would be needed to defeat Japan. Scientists and military figures considered them as nothing more than large-scale conventional weapons. Each atomic bomb could accomplish what took a week with conventional bombing and, as the radiation effect was still unknown, there seemed no reason to withhold using them. The quote less often heard:

Oppenheimer later recalled that, while witnessing the explosion, he thought of a verse from the Hindu holy book, the Bhagavad Gita (XI,12):

कालोऽस्मि लोकक्षयकृत्प्रवृद्धो लोकान्समाहर्तुमिह प्रवृत्तः। ऋतेऽपि त्वां न भविष्यन्ति सर्वे येऽवस्थिताः प्रत्यनीकेषु योधाः॥११- ३२॥
If the radiance of a thousand suns were to burst at once into the sky, that would be like the splendor of the mighty one ...Years later he would explain that another verse had also entered his head at that time...“Now I am become death, the destroyer of worlds....”

Bits of southwestern sand were transformed by the intense heat, reborn as a peculiar glass-like material. Today, one can’t legally go out in the field and gather trinitite, which—by the way—is radioactive, though it becomes less so over time.