I feel like I should kill my players from a cave in, they were warned repeatly that the cave was filled with high explosive material and kept fighting in it. They got some debris down to slow it down some but it was in an area with a lot of explosive and in a cave. But killing 3 of the 4 players will definitely ruin the game.
So I'm debating on how to handle it. Leaning towards critical injury rolls with a very high base to start with like +70 or so. Or maybe making very hard resilence checks to gibmve them a chance to survive.
What would you do in your game?