A Norwegian couple made an unusual historic discovery during renovations of their home. First, they found a number of Viking-era artifacts, and then archaeologists declared that they had found a Viking grave, right there, under their floor. Experts have carried out a survey of the site and the grave is being hailed as a very significant find.
I would put plexiglass as the floor. While sitting down for dinner I'd just look down and say "thanks for coming over, Olaf, "and proceed to eat my fermented shark that's been sitting outside for a month.
That's the least of their problems. The bigger issue is that who knows how long the dig site will be kept open for. Meanwhile whatever space this was is entirely unusable and littered with archeologists. Great for history but unfortunate for them.