Answer
The oxygen concentration [O2] of the blood of a victim of drowning is very low. Deoxgenated hemoglobin changes shape and the blood becomes a darker red--not blue.
Work Step by Step
The poorly oxygenated blood appears blue because the skin absorbs more of the red light and diffuses more of the light in the blue part of the spectrum-- this is picked up by our eyes, but neither the veins nor the blood are blue.
