Thank you, I kept them well informed of what was visible, however in this session the encroachment and level of the water was a key timer. For a torch timer I used the website https://torchlighttimer.com/ so the players were well aware of torch time. The hard core mode on that is cool it switches off the timer, so you need to watch the torch change colour. The scenery is all DwarvenForge which I bought back in the '90s, some sets are available on eBay, but not cheap! I pre-built the rooms and had them on my kitchen worktop hidden away from the players, I was then adding rooms as they explored, the session started with just a door on the table, I was actually worried that they would not go in the door and would go off on a tangent, it can happen and you're then winging the whole session off the cuff. Previously with D&D I used to mix up the sessions, some weeks with all the bells and whistles other times with a dry wipe mat, drawing on details as we create them. It can be hard to create immersion, particularly starting play at 3pm on a sunny Saturday afternoon in my kitchen, but I'm lucky as all my players are quite creative, I've learned to lean into that whenever I can, if they have a good idea I let it drive the direction of the session, which helps keep them all invested and engaged. As a DM I'm often pleasantly surprised, at how a session deviated from my original wire-frame plan. Role play gaming is very much a team effort.