You wrote something about underwater canyons?
They are all over the ocean floor...and they were not all caused by puny little rivers running into the sea, either.
Like I said, moving that amount of water in a single day would have cut a sharp walled trench similar to the Grand Canyon. Desert washes do not have gently sloped banks similar to a lake. They look as if they were cut with a giant fire hose.
Is there any sharp walled trench landscape on the edge of Lake Titicaca?
You wrote something about underwater canyons?
They are all over the ocean floor...and they were not all caused by puny little rivers running into the sea, either.
The ruins of an ancient temple have been found by international archaeologists under Lake Titicaca, the world’s highest lake.
A terrace for crops, a long road and an 800-metre (2,600 feet) long wall was also found under the waters of the lake, sited in the Andes mountains between Bolivia and Peru.
Dating back 1,000 to 1,500 years ago, the ruins are pre-Incan.
http://news.bbc.co.uk/2/hi/americas/892616.stm