The fact there is no no check points is the worst idea in destiny history. We were trying to open the door for the last boss and the staff completely disappears leaving our fire team lost and confused. There is no way to whip or restart the mission leaving us no choice but to go back to orbit and run the tunnels for a second time. We barley get half way threw the the tunnels before we get another error code sending us back to orbit. This needs to be fixed and is beond agrovating. Once again youv over complicate things that should be simple. Add check points or make it so you can reset the current challenge.