Answer
You are compressible, and a rock is not.
When you are submerged, the water pressure squeezes you and reduces your volume. Your mass stays the same, so this effect increases your density, the ratio of mass/volume.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 13 - Think and Explain - Page 261-263: 81
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