Well, there was no UFOs. The travel agents booked the past disaster experiences to thrill seekers from future. I still can not remember the name. The first disaster was a plane, a train wreck, there was a major fire in a stadium etc. with a lot of plot twists.
If you just read the science section of the forum, we are begining to think about creating wormholes, nano technology, quantum devices etc. Suppose we find a way to use the wormholes to view the past or goto the past in a vehicle to watch past events such as first nuclear explosion, begining of WW I and II, hirosima, etc....for get the truth of the past....then imagine if some of us saw those vehicles today....who would not be interfacing with us...
just some wild thoughts...in the pseudo section....