Getting a Loch on Nessie?
Could such a creature be alive today in the loch? It is likely that some large, sea-dwelling reptiles survived Noah’s Flood (ca. 4350 years ago), but the survival of such a creature at Loch Ness stretches credulity. The lake has been repeatedly studied by sonar and other instruments.
http://www.answersingenesis.org/articles/am/v3/n1/loch-on-nessie