I did this once and followed the team down into the vault. They all kept looking back at me like: "is this guy really gonna follow us the enitre way? lol?" But eventually they disappeared before the first chest, which wasn't there for me and the crack entrance was not there either. So I went all the way back and turns out the vault was closed and I couldn't leave, I killed myself a few times, but It didn't work. So I had to go back into orbit where I then lost connection to destiny servers and then stubbed my toe IRL. This is why I will never help anyone in the future.