tl;dr: Peat fires are notoriously difficult to extinguish with water (millions/billions of litres of water applied over months), but water mixed with a certain non-toxic surfactant does a better job of penetrating peat and snuffing the blaze. This may be a very good thing indeed, considering how much of the thawing arctic, e.g., is peat, and how much more CO2 peat fires release than do forest fires.