I have been lurking here for quite a while, but finally, I have a question for everyone, has anyone here ever actually built and lived in a scout pit?

I am referring to essentially a grave that you cover and camouflage so that you can remain low profile in a potentially hostile area.

I have built and slept in lots of shelters, and I am not claustrophobic (very much) but this idea still kind of makes me apprehensive.

I have a class coming up in which we will be building and sleeping in our scout pits for about a week, any building/use tips that I can take with me?

Here is an example of what I am talking about.

http://www.wildwoodsurvival.com/survival/shelter/scoutpit/ygas.html

Thanks in advance for your help.