Document is an item which is used for placing a structure with SCP (containment chamber). It won't place the chamber if
there are any blocks with tile entities in the way or unbreakable blocks. You can place a preview of the chamber area by
Shift + right clicking - it will place grey outline blocks of the chamber and a green outline block where you are supposed
to click again if the location of the chamber suits you. These blocks will disappear after 15 seconds by themselves, but
you can change this value in options. The chamber usually has a sliding door entrance with a card reader with appropriate
security level. You will need a keycard to trigger the card reader.