After reading some of the replies to the "Scariest moments on at sled" it appears as if running on the lakes and open water create the most tense memories. I have found that after I had intentionally travelled over open water I had a more secure feeling because I knew what to expect. I have found that if you are travelling between 30 to 50 MPH you would hardly notice a change from ice to water. I do not suggest you charge out the door and try this. A warm day with a section of open water about three feet deep is suggested. Also have some other sleds near by. PS I have not sunk my sled yet, and hate cold water.