A starship 5 kilometers long and 500 meters wide is detected approaching Earth, it puts out a significant amount of gamma rays and high energy plasma as it slows down at a rate of 9.81 meters per second. As it approaches Geosynchronous orbit over South America, it throttles back its main thrusters and starts tumbling end over end to maintain centripetal acceleration to make up the difference of its throttled back main engine. The gamma ray out put drops as its main engines throttle down to zero thrust, but the engine chamber still outputs a muted signature of gamma rays. Telescopic observation detects a cable being lowered towards the Earth's surface the full 42,164 kilometers. An object suspended beneath the cable touches down on a clearing in the rainforest and firmly plants itself into the soil. The starship does nothing further on its own. Investigators approach the cable The cable is 50 centimeters wide, the object planted underneath it is a 25 meters wide cylinder that is 4 meters in height. A door slides opne upon the approach of the investigator, interior lights illuminate the chamber inside. 3 display screens show the view outside the chamber, they cover 50% of the wall surface, showing a rainforest clearing, examination of the view displayed on the screen and the immediate surroundings of the chamber show that they don't match. The center of the chamber contains a number of cylindrical booths each one about 1.5 meters wide and 3 meters long placed in a horizontal position on the floor. The booths are arranged in a circular pattern with their lengths aligned in a radial orientation in the chamber. The router ring contains 39 of these booths. A circular row 1 meter inside that has 32 such booths. a third concentric ring seperated by a 1 meter gap holds 26 booths, a fourth ring inside than contains 20 booths for a total in all of 117 booths in the chamber. In the center of the room are banks of control equipment, and small screens showing the interior of a chamber similar to this one but without the investigators in it. Certain angles from cameras in the ceiling show wall screens in that other room which actually show the surroundings of the chamber the investigators are in. The cylindrical booths seem designed to hold human sized subjects and a modest amount of equipment. The controls in the center of the room are arranged with human sized and proportioned chairs among the monitoring equipment. Investigators discover the equipment controls the booths, activation of certain controls, fills a booth with a white milky substance that quickly hardens, a clear fluid then pours on top and dissolves the hardened solid. In in the other chamber shown in the monitors a similar booth fills with a white milky fluid and which hardens at the same time as the process is going on in the chamber the investigators are in, a clear liquid then pours in and desolves the resulting solid inside the other chamber's booth. Further investigation reveals than an object placed in a booth prior to the aforsaid process is initiated, will dissolve away after the white milky fluid hardens around it and the clear liquid is added, but that same object will appear in a booth in the chamber that the monitors are showing. Another control reverses the process and the object reappears in the chamber the investigators are in. The next step the investigators try is to put live animals in those booths, the milky substance pours around them, the creatures panick and try to escape but they are quickly engulfed, the substance hardens around them, and the clear liquid is added dissolving the substance and them while in the room shown in the monitor the milky substance is dissolved away by the clear liquid and the live animal appears in the corresponding booth from where the hardened milky substance was dissolved. At a further point a human volunteer tries one of the booths, he appears on one of the monitors showing the other chamber as he rises out of the booth, dusting himself off and checking on his equipment, clothes, and all. The explorer exits the chamber through one of the sliding doors, into the clearing in the rainforest shown on the wall monitors of the chamber the investigators are in, the explorer waves back and looks around. Pulling out a pair of binoculars, he scans the sky. An identical starship is seen at the top of the cable. The explorer pitches a tent, examines the plant and animal life in the immediate area, and then at night he studies the sky, takes some photographs, and then the next day he returns to the chamber undergoes the same process to bring him back to the chamber the investigators are in and uploads the pictures he's taken. Examination of the evidence indicates he traveled back in time to an era corresponding to 18,000 years ago or about the year 15999 BC to be precise. Attempts were made to communicate with the mothership(s) but they aren't communicative.