I need to know what sort air supply would get him through that time period - a hole drilled into the coffin would need to be how big in order to supply adequate air for his survival? Or would the lid being sealed improperly do it?
Would he need to have a source of water with him like a canteen?
Bodily functions I assume would just have to happen as they will - I don't think there can be provisions for those?
Google fu has failed me hard on this, probably because it's just a really weird thing to need to know. Thanks for any insight!