First the acid in the water has to destroy the decomposing bacteria in the water itself(Chemistry of Bogs). A very special type of moss is essential to that procces.It is called sphagnum moss. The sphagnum moss sucks out all of the calcium left in the dead humans body so all that is left is just soft tissue. When their is only soft tissue in the body that means only the skin and major organs stay in place. Even though their are no bones left the body still keeps its shape. This moss also covers the top of the bog not letting in any oxygen. Oxygen is essential to decomposition. The process that these iron age victims of murder and sacrifice have become some of the best preserved pieces of history is truly a