Why would they walk out to those marshes in the middle of the night in the winter?
I wondered that myself. It was cold-under 30 degrees, and there was a high tide during the night (I think). I wonder if their coats/jackets were gone from the house? No car, no wallet, no cell phone...
Here's an update: 'some indication that they were boating.'
http://www.pressherald.com/news/Search-for-missing-students-turns-up-clothing.html