Okanagan Lake is a large, deep lake in the Okanagan Valley of British Columbia. Its depth is approximately 1000 ft. From Okanagan Lake, there comes many reports of a mysterious creature (or creatures) named Ogopogo. Below, is a close encounter with two Ogopogos!
In 2000, a marathon swimmer named Daryl Ellis saw two 20 to 30 foot long animals while he was swimming across the lake for nearly two hours. One of the creatures swam near him and he could see its large eyes which were about the size of a grapefruit. Their color was grey/black.
Now, this is definitely what I call "a close encounter!"
Sources: Dinosaurs: Dead or Alive? O'Donnell, Phillip Xulon Press 2006 and http://sunnyokanagan.com/ogopogo/