The reason that the nail bed appears pink is the presence of a large number of melanocytes in the underlying dermis.

The answer is FALSE.

Explanation:

The pink color that the nail bed presents is due to the significant number of blood vessels, specifically capillaries, coursing under the skin. This usually indicates a healthy nail bed. Any discoloration away from the pink color would usually indicate an underlying disease.

For example, if it turns yellowish, it may be an indication of jaundice or liver disease. If it's bluish to whitish in color, hypothermia or anoxia may be present. A distinct condition called Onychomycosis, a fungal infection of the nail, may produce whitish to yellowish discoloration with accompanying thickening of the nail bed.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)