What happens if things aren't properly decommissioned? There are huge environmental impacts. You can get the contamination of groundwater because the fluids from the well leak into groundwater, contaminate aquifers and, potentially, our drinking water. If hydrocarbons build up under pressure, they can potentially blow out. If the wells and the infrastructure are offshore, then those may come loose from the seabed. And of course, if you haven't got a properly decommissioned well, if there's something like an earthquake that can also cause problems.