As morning dawned in Avalon, the sun's rays streamed through the massive stone entrance. Challenger and Marguerite were preparing to hold a presentation about their mind-boggling discoveries. Their audience, composed of Malone, Roxton, Veronica, Abigail, Summerlee and Finn waited in eager anticipation.

Challenger cleared his throat, breaking the hush. "My dear friends, today we will unveil discoveries that could reshape our understanding of history, and indeed, our very world."

Marguerite was holding an old parchment with strange symbols and diagrams. "We have discovered the remnants of ancient civilization whose wisdom and technology were profound."

"This," she added, pointing to a detailed diagram, "represents a device that promises instant communication across endless distances."

Challenger nodded: "If we manage to set it up we could communicate directly between Plateau and England without any delay."

Malon stared in awe. "That would mean we could always stay in contact."

Challenger looked at Malone. "Yes and no. We only have instructions on how to use it, but we don't fully understand how it works. Abigail warned us that there could be potential disturbances to the fabrics of time and space. Hence we will only use it in urgent situations."

Abigail further explained. "Such advancements, while promising, can be a double-edged sword. You must tread carefully."

Malone chuckled, shaking his head in disbelief. "It's like something out of those new science fiction novels. But given all we've encountered, I'm inclined to believe."

Marguerite unveiled a strange artifact. Nestled in her hand was a compact, circular device, its metallic frame adorned with intricate patterns that pulsed with a gentle blue light. The device hummed with a low energy, hinting at the profound knowledge it contained.

She turned the device in her hand, allowing the light to catch its complex etchings. "When two of these are synchronized, they can establish a connection. For instance," Marguerite's eyes sparkled with anticipation, "when I wish to speak with Veronica from England, she'll appear before me as a vivid, lifelike hologram."

The group murmured in awe, trying to grasp the enormity of what was being presented to them.

Finn exclaimed, "Wow, we don't even have stuff like that in the 21st century!" The device, ancient as it was, seemed centuries ahead of its time.

Challenger cleared his throat. "There's more. This… " he said, pointing to another diagram depicting concentric circles linked by radiant beams, "is a teleportation system. It works on a similar mechanism like my teletransportation machine that brought us all to Finn's era."

Marguerite responded. "With this, one could step from the plateau and emerge in the heart of London within moments."

Finn looked in admiration. "Cool. There was actually stuff like that in comic books. They were always my favourite."

Malone, ever the journalist seeking a sensational angle, asked. "Given the advanced nature of this technology... could it be of extraterrestrial origin?"

Abigail replied, "The thought has indeed crossed my mind. There's much about the universe we don't understand. Alien technology or a past terrestrial civilization with advancements beyond our comprehension? Both are plausible. But the truth is, we may never know for certain. It's believed that several centuries ago, someone brought all these items and parchments to Avalon. Since then, they've been safeguarded here, a testament to knowledge and mysteries long past."

Abigail looked around the room, ensuring she had everyone's attention. "Regardless of its origin, I cannot stress enough that this must remain private knowledge. It's a way for Veronica and Ned to visit you in England and for all of you to always have a means to return to the Lost World, as well as to send crucial messages when needed."

Finn smiled, her eyes shimmering with a touch of nostalgia. "I don't know why, but this makes me really happy."

"I know why." Veronica said softly. "In a way, we will never have to say goodbye. The adventures will continue."

Roxton responded with warmth: "I must say, I like that very much."

The group shared a moment of silent agreement, feeling the weight of the beautiful bond they had forged in the Lost World.