"Prepare for an offshore landing," the pilot announces, before landing on a platform 250km (155 miles) from Denmark's west coast.
The helicopter has just circled around Nini, a nearby rig rising up from the choppy waters of the North Sea.
The rig sits over an almost-depleted oilfield that's about to get a second life as a massive carbon storage project called Greensand Future.
The plan is to pump thousands of tonnes of climate-warming CO2 into the old oil field.
We step on to Siri, a larger "mother platform" that has a control centre manned by offshore workers.
