The same article discusses "big bubbles coming up in the harbour". Very reassuring.

My favourite YIMBY/public servant friend did point out to me this evening that Rodd Staples might be some guy, but MANY levels of people below him probably had strong experience in "tunnelling through yoghurt" because there are only so many jobs in "driving massive tunnel machines" or "engineering supervisor for massive tunnel machines" in the world and in the last 15 years several of those jobs have been "under the Thames", famously squelchy territory.