After a months-long search, Australian investigators have recovered a radioactive capsule that was lost in Western Australia.

The capsule, which was used in industrial radiography, was found in a remote part of the state, leaving investigators with many unanswered questions about how it went missing in the first place.

The capsule was found in a location that was “like finding a needle in a haystack,” according to a statement from the Australian Radiation Protection and Nuclear Safety Agency.

The capsule, which was about the size of a pencil eraser, was found to be intact and unharmed, and its radioactive source was safely returned to its owner.

The investigation into the capsule’s disappearance is ongoing, but officials are reminding the public to take proper safety precautions when handling radioactive materials.

“This incident highlights the importance of following the safety procedures and protocols that are in place to ensure the safe use of radioactive sources,” the statement said.

The recovery of the capsule is a relief to those involved in the search, but the mystery of how it went missing in the first place remains unsolved.