This is Summer of Trinity - a daily description of events in the summer of 1945, touching points around the world but centered (as that summer was) on the Trinity nuclear test. This episode has daily events for the week ending Saturday July 21th, 1945.
Sunday, July 15,1945 - 1 Day Before Trinity
12th Army Situation Map (Germany and surrounding areas)
https://www.osti.gov/opennet/manhattan-project-history/Events/1945/trinity_evaluations.htm
The American contingent arrives at Potsdam. The imminent start of the conference was a major reason the Trinity test had been planned of this week.
Returning from his one-day shakedown cruise for the USS Indianapolis, Captain McVay meets with Captain William Parsons of Project Alberta and Admiral William R. Purnell - one of the chief military advisors for the Manhattan Project. They don’t mention these connections to McVay, who is informed only that his ship has been chosen for an important mission: He is to proceed with all possible speed across the Pacific, first to Pearl Harbor, Hawaii, and then to the Marianas, on the edge of the Philippine sea. There he will deliver his cargo to the air base on the island of Tinian. He is assured that every day saved delivering the cargo is a day closer to the end of the war. He is to safeguard the cargo at all costs - ALL costs. If the ship is lost, his first priority will be saving this cargo - if necessary, a lifeboat is to be used to ensure it is undamaged. McVay will not, however, be told what the cargo actually is.
There are some clues, however. There are two Army officers who will accompany the cargo and see it safely ashore at Tinian: Major Robert Furman, and Capt. James Nolan. While they are presented as “artillerymen,” McVay eventually learns from Captain Nolan that he is actually a doctor, with the implication that there are some health concerns about the cargo. Nolan assures McVay that there is no actual danger to the crew of the Indianapolis. Nolan does not mention that he is one of two medical doctors at Los Alamos - not that McVay would have know where that was - nor that he is the doctor who put together the safety plan to ensure the health of those attending the upcoming Trinity test. But McVay knows that there are not a lot of materials that are both relatively small and enough of a health concern to merit the attendance of a doctor.
https://ahf.nuclearmuseum.org/ahf/profile/james-f-nolan/
https://en.wikipedia.org/wiki/Charles_B._McVay_III
https://en.wikipedia.org/wiki/USS_Indianapolis_(CA-35)
Monday, July 16,1945 - Trinity
Yoko Moriwaki's diary is available through online and other booksellers, and in some libraries.
https://www.amazon.com/Yokos-Diary-Paul-Ham/dp/0733331173/r
https://www.dearfolksies.com/wabern-germany-july-10-august-23-1945/6/
https://www.trumanlibrary.gov/node/400674
Tuesday, July 17,1945 - 1 Day After Trinity
The Potsdam Conference began in Potsdam, occupied Germany. Representatives of the Soviet Union, the United Kingdom and the United States met to discuss how to administer postwar Germany.
https://www.osti.gov/opennet/manhattan-project-history/images/szilard_petition.htm
https://biology.indiana.edu/documents/historical-materials/gest_pdfs/hgSzilard.pdf
Wednesday, July 18,1945 - 2 Days After Trinity
Thursday, July 19,1945 - 3 Days After Trinity
https://www.atomicheritage.org/history/timeline
Friday, July 20,1945 - 4 Days After Trinity
https://en.wikipedia.org/wiki/Pumpkin_bomb
https://en.wikipedia.org/wiki/Proximity_fuze - The atomic bombs used these, which were actually a very new technology, but one that had already proven its worth - Patton proclaimed that the proximity fuze had contributed greatly to the American success in the Battle of the Bulge.
Saturday, July 21,1945 - 5 Days After Trinity
https://en.wikipedia.org/wiki/USS_Underhill
https://ussunderhill.org/index.html
