Instead of using the DLR, we travelled beneath the Thames using the Greenwich foot tunnel. In contrast to outside, it was damn chilly down there. I looked for leaks but didn't spot any, so considered emptying a bottle of water on the tunnel wall to spread panic.
After we reached Island Gardens on the other side of the tunnel, we decided to catch a rather crowded DLR up to Canary Wharf and relax, bringing our perambulations to a close.