The Calgary Herald published a timeline of events from the Concordia casualty to rescue.
Wednesday, Feb. 17
2:30 p.m. – A distress signal goes out from the Concordia
9:00 p.m. – Brazilian navy receives alert. Navy officials spend 18 hours confirming what ship sent the signal, whose flag it was under. Confirms location, attempts radio contact with the Concordia. Contacts the school — is informed the last contact with the ship did not indicate any problem.
Thursday, Feb. 18
2:30 p.m. – Brazilian navy asks air force to do a flyover of the area and alerts merchant ships in the region. Stormy seas prevail.
5:00 p.m. – Brazilian air force spots lifeboats.
9:00 p.m. – Merchant ships Crystal Pioneer and Hokuetsu Delight told to go to location. Stormy seas, bad weather continue.
Friday, Feb. 19
4:00 a.m. – Crystal Pioneer spots lifeboats — due to darkness and high seas, waits to pluck the survivors to safety.
7:00 a.m. – The relieved passengers start boarding the Crystal Pioneer and Hokuetsu Delight.
9:00 a.m. – Last lifeboat located, passengers transferred to Hokuetsu Delight.
Saturday . Feb. 20 – All 64 students, teachers and crew arrive safely in Rio de Janeiro
Sources: Nigel McCarthy and The Brazilian Navy