After the EgyptAir plane crash in the Mediterranean shook the world with grief, a French vessel LaPlace could finally detect signals from one of the black boxes of the plane. Almost a month after the accident, investigators hope that the new development in the case will shed light on the crash, the cause of which is still shrouded in mystery.

The French air accident investigation agency, BEA, was initially skeptical on whether the signals detected from the seabed were from EgyptAir flight MS804. However, it later confirmed that the signals were indeed from one of the recorders on the plane.

Confirming the news, BEA’s Director Remy Jouty gave his statement to the press, “The signal of a beacon from a flight recorder could be detected…The detection of this signal is a first step.”

Contradicting reports about the crash’s final moments have been doing the rounds ever since the accident took place on May 19. New investigation reports suggest that signals diagnosed from a flight recorder will prove a major breakthrough in solving a few questions, such as why the plane crashed and what happened in the final hours of the crash.

CNN aviation analyst Mary Schiavo points out that detecting the beacon from the black box is a sign that the wreckage site is within one to three miles since this encompasses the distance that the beacons can broadcast. He also said, “Hopefully they have finally got the right beacon, the right location, and soon we’ll have answers.”

According to BBC, LaPlace, which is managed by the Deep Ocean Search company, is using acoustic detection systems to listen to the locator “pings” coming from black boxes underwater. Special arrangements have been made to bring robots on board that can dive up to 3,000 meters to help retrieve the device.

EgyptAir was flying over the Mediterranean Sea last month with 66 passengers and crew on board when it disappeared from the radar without leaving any trails behind.