According to British media reports on August 31, 22-year-old Lisa Flynn and 21-year-old Chris Cremers arrived at the airport in Panama excitedly.After months of planning, the two Dutch students embarked on the famous "Pianist Trail" hiking trip, eager to explore and venture.

The trail through the dense cloud forest on the slopes of Mount Palu was supposed to be a highlight of their journey. But hours later, they disappeared, leaving behind one of the most disturbing mysteries of modern travel. Months later, fragments of their remains were found on a remote riverbank deep in the jungle.

Investigators attempted to restore their last days with the strange photos found in their cameras after their disappearance.But because of the lack of solid evidence, speculations spread rapidly, ranging from accidental accidents to more dangerous explanations such as murder, abduction and even organ trafficking.

On the morning of April 1, 2014, the two women embarked on a journey. According to some accounts, they had brunch with two Dutch men before setting out and brought a dog with them from a nearby restaurant, although details vary. The hike should have taken about three hours, but the two still did not return by dark.

Sources said that the restaurant owners sounded the alarm when they found their dog home alone that night, while Kremers and Flen did not return. When contacting Kremers' father Hans failed, and they missed the next day's appointment with the local tour guide, the locals fell into further panic.

On April 6, the girls 'families arrived in Panama, and a large-scale search and rescue operation was launched with a reward of US$30,000 to find their whereabouts. Search dogs searched the rough terrain for traces of Forren and Kramers, but found nothing. It was another two months before authorities found any clues related to their disappearance.

On June 14, a local woman discovered Flynn¡¯s blue backpack on the river Coulebra near Altoromero, away from the main route of the Pianist Trail. Despite the rainy season in Panama, the backpack was clean and dry, carrying $88 cash, sunglasses, two women¡¯s bra, their mobile phones and Flynn¡¯s camera.

Suspicions were heightened by local claims that there were no backpacks there the day before. Kremers'denim shorts were also found nearby, with mixed accounts as to whether they were carefully placed on rocks or scattered randomly. Friends'phones showed 77 attempts to call emergency services after about six hours of walking.

The first attempt to make a distress call was at 16:39, from Kramers 'mobile phone. Not long after, at 16:51, Furren's mobile phone also made a try. Due to poor signal in the area, all calls were not connected.

After five o¡¯clock in the morning on April 4, Flynn¡¯s cell phone was out of power and was no longer used.During the period from April 5 to 11, Kramer¡¯s iPhone was turned on several times, but no longer entered the correct PIN code, suggesting that she could no longer control the phone.

The most confusing clue about the final moments of the two women came from Flynn¡¯s camera.Investigators found 133 photos, taken at the latest seven days after they disappeared, including 90 photos taken in the dark before dawn on April 8, 2014.

Most of the photos can hardly see anything except the leaves of trees that are dark or illuminated by flashlights, indicating that friends are deep in the jungle. There are several photos showing scenes that appear to be carefully arranged, including red plastic inserted on the sticks, paper towels, small mirrors on rocks, and a time stamped 1:49, showing the back of Cremers's head.

There was previous speculation that blood could be seen near her temple, but a clearer version did not confirm injuries. Adding to the mystery is the missing 509th photo: it does not exist in the memory card's file structure, raising questions about whether it was intentionally deleted, damaged, or simply non-existent.

Subsequent searches along the river turned up scattered human remains: a boot-wearing foot, a pelvic fragment and various bone fragments. DNA testing confirmed that they belonged to Kramers and Fren. Inexplicably, while some of Fren's remains still retained some skin, Kramers' bones appeared "white" and high in phosphorus, which did not match the local soil conditions.

A Panamanian forensic anthropologist pointed out that there were no cuts or scars on the bones, adding another layer of mystery to the mystery. There were too few remains to determine the cause of death, but the most likely theory is that the two women either suffered an accident or died after being lost. However, the unusual photos, combined with bizarre discoveries, sparked a wave of conspiracy theories that the two women were followed, kidnapped and murdered while on foot.

The official investigation changed over time. Panama authorities initially classified the case as murder and later as kidnapping. However, by March 2015, the case was officially closed and the conclusion was that two women died in a pedestrian accident. The Dutch forensic team believed that rough terrain, 30-40 meters of cliffs and rushing rivers could explain the condition of the remains.

But despite the official explanation, the debate about what really happened continues to this day, with many arguing that certain accounts do not match the physical evidence. These include the sudden appearance of the backpack, the grizzled state of Kramers' bones, the missing 509th photo, and 77 unanswered emergency calls, all suggesting a long life-and-death struggle.

In recent years, new and often controversial theories have emerged. Highlighting suspicious details and strange camera photos, some investigators believe the two women were victims of kidnapping or murder. They pointed out that the discovery of their remains after months of large-scale search and rescue may indicate the involvement of a third party, and similarly, the possibility that cameras have been tampered with or objects posed may also suggest the involvement of a third party.

Another sophisticated theory suggests that organ traffickers learned the information of the two tourists, leading them to being abducted while walking and killed a few days after being imprisoned.Given the lack of supporting evidence, most researchers believe this scenario is highly unlikely to happen.

Many experts still support the official explanation of the accident, believing that this couple simply deviated from the path, lost direction, and eventually died from natural factors. The co-author of Lost Jungle, Eugene Snowden, previously told the media, "We don't know if anyone is involved in it, we can't rule out this possibility, we think the most likely explanation is that they suffered an accident, but that's not a hundred percent certainty. The only way to reach a complete conclusion is to find the rest of their remains. I think they should have their remains in the jungle. But this is a tough task."

Over the past five years, public interest in the case has continued to decline.In 2021, Dutch writers Maya West and Eugene Snowden published a book after scratching the police archives, offering a new perspective on this mystery.Their work pointed out unresolved inconsistencies, making other theories still exist.

By the 10th anniversary of April 2024, this legendary story has not been forgotten.The progress of forensic methods and the persistence of amateur investigators have prompted calls for re-evaluation of bone and digital data.

In September 2023, a documentary re-examining the last days of the two women and the so-called investigative negligence pushed the case back into the spotlight, sparking new debates about how evidence is collected, categorized and analyzed.

In the course of these developments, the relatives of Cremes and Flynn have adhered to the official conclusions about the tragic accident, and although the public¡¯s fascination with the case continues, they have also found some consolation from the end of the case.