Did migrants reject help before deadly Greek wreck, or beg for it?

This much is clear: On June 9, an old steel fishing trawler left eastern Libya for Italy, carrying far too many people.

As many as 750 men, women and children from Syria, Egypt, the Palestinian territories and Pakistan were on board, fleeing hopelessness in their home countries and trying to reach relatives in Europe.

Five days later, the trawler sank off the coast of Greece in one of the deepest parts of the Mediterranean Sea. Only 104 people, all men, survived. The remains of 78 people were recovered.

There are still more questions than answers about what led up to one of the worst shipwrecks in recent Mediterranean history.

Activists, migration experts and opposition politicians have criticised Greek authorities for not acting earlier to rescue the migrants, even though a coast guard vessel escorted the trawler for hours and watched helplessly as it sank.

Below is a timeline of events based on reports from Greek authorities, a commercial ship, and activists who said they were in touch with passengers. They describe sequences of events that at times converge, but also differ in key ways.

The Greek coast guard said that the overcrowded trawler was moving steadily toward Italy, refusing almost all assistance, until minutes before it sank. This is in part supported by the account of a merchant tanker that was nearby.

But activists said that people on board were in danger and made repeated pleas for help more than 15 hours before the vessel sank.

International maritime law and coast guard experts said that conditions on the trawler clearly showed it was at risk, and should have prompted an immediate rescue operation, regardless of what people on board may have said.

Much of these accounts couldn't immediately be independently verified.

Missing from this timeline is the testimony of survivors, who have been transferred to a closed camp and kept away from journalists.

All times are given in Greece’s time zone.

Around 11 a.m. on Tuesday, Italian authorities informed Greece that a fishing trawler packed with migrants was in international waters southwest of the Peloponnese. Greece said the Italian authorities were alerted by an activist.

Around the same time, human rights activist Nawal Soufi wrote on social media that she had been contacted by a woman on a boat that had left Libya four days earlier.

The migrants had run out of water, Soufi wrote, and shared GPS coordinates through a satellite phone showing they were approximately 100 kilometers (62 miles) from Greece.

“Dramatic situation on board. They need immediate rescue,” she wrote Tuesday morning.

Over the course of the day, Soufi described about 20 calls with people on the trawler in a series of social media posts and a later audio recording. The Associated Press couldn't reach Soufi.

A surveillance aircraft from the European Border and Coast Guard Agency, commonly known as Frontex, spotted the overcrowded trawler at 11:47 p.m. and notified Greek authorities, the agency told the AP. On Saturday, Frontex told the AP that its plane had to leave the scene after 10 minutes because of a fuel shortage, but that it had also shared details and photos of the “heavily overcrowded” trawler with Greece.

At 2 p.m., Greek authorities established contact with someone on the trawler. The vessel “did not request any assistance from the coast guard or from Greece,” according to a statement.

But activists said that people on the boat were already in desperate need by Tuesday afternoon.

At 3:11 p.m., Soufi wrote, passengers told her that seven people were unconscious.

Around the same time, Alarm Phone, a network of activists with no connection to Soufi who run a hotline for migrants in need of rescue, said they received a call from a person on the trawler.

“They say they cannot survive the night, that they are in heavy distress,” Alarm Phone wrote.

At 3:35 p.m., a Greek coast guard helicopter located the trawler. An aerial photo released showed that it was packed, with people covering nearly the entire deck.

From then until 9 p.m., Greek authorities said, they were in contact with people on the trawler by satellite phone, radio, and shouted conversations conducted by merchant vessels and a coast guard boat that arrived at night. They added that people on the trawler repeatedly said they wanted to continue to Italy and refused rescue.

At 5:10 p.m., Greek authorities asked a Maltese-flagged tanker called the Lucky Sailor to bring the trawler food and water.

According to the company that manages the Lucky Sailor, people on the trawler “were very hesitant to receive any assistance,” and shouted that “they want to go to Italy.” Eventually, the trawler was persuaded to accept supplies, Eastern Mediterranean Maritime Ltd. wrote in a statement,

Around 6 p.m., a Greek coast guard helicopter reported that the trawler was “sailing on a steady course and heading.”

But at 6:20 p.m., Alarm Phone said that people on board reported that they weren't moving, and that the “captain” had abandoned the trawler in a small boat.

“Please any solution,” someone on board told Alarm Phone.

The Greek authorities’ account suggested the trawler stopped around that time to receive supplies from the Lucky Sailor.

At 6:55 p.m., Soufi wrote, migrants on board told her that six people had died and another two were very sick. No other account so far has mentioned deaths prior to the shipwreck, and the AP hasn't been able to verify this.

Around 9 p.m., Greek authorities asked a second, Greek-flagged, merchant vessel to deliver water, and allowed the Lucky Sailor to leave.

Then, at around 10:40 p.m., a coast guard boat from Crete reached the trawler, and remained nearby until it sank. According to the coast guard, the vessel “discreetly observed” the trawler from a distance. Once again, the coast guard said, the trawler didn't appear to have any problems and was moving “at a steady course and speed.”

As many as 500 people are missing.