Q: My serial killer has predilections that make him want his (female) victims to float face up when they are found. He strangles them and then places them in the water, so they don’t actually die of drowning. Would plugging the throat or taping the mouth and nose shut (so air stays in the lungs) be a good way for him to achieve this effect? What else might work?
S.K. Davenport, Pittsburgh, PA
A: Plugging the throat or taping the mouth and nose would make little difference since there is not enough air in the lungs to cause a body to float. Virtually all bodies sink when first tossed into water. This is not absolutely universal as sometimes clothing can gather air and keep the victim afloat but for the most part they sink. They do not float again until the decay process has progressed to the point that gases have collected within the abdomen and the tissues and the body becomes buoyant. Most bodies float facedown for a very simple reason–the arms and the legs tend to fall in that direction rather than backwards so their weight keeps the body face down.
In order to make the body float he would have to do something to increase the rate of decay and since this is predominantly temperature dependent it would be best if the body was placed in warm water such as a heated pool, a Jacuzzi, or a swamp in Louisiana. Alternatively–and this is over-the-top sinister–he could inject air into the victims abdomen and chest and even the tissues of the legs and arms. If he injected enough the body would float immediately. In order to keep the body on its back, he would have to apply weights of some type that would weigh down the backside of the corpse. Maybe some large fishhooks placed deeply into the flesh and muscles with weights attached. Just a diabolical thought.