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Underwater photography. We asked you to share your underwater pictures. View more on GuardianWitness, and check out this underwater gallery from the Travel desk.
1. Home sweet home. Photograph: Dave Johnson / GuardianWitness
2. Nudibranchs. Photograph: ID306923 / GuardianWitness
3. Fire urchins. Photograph: pxguru / GuardianWitness
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