At the bottom of a bottle of water this diver may well come back empty-handed, without having seen any fish or coral. If he's lucky he might blow bubbles in sparkling water, otherwise his dive will be just be flat!
Glass water bottle (borosilicate)
Dimensions : 30 x 8.5 x 8.5 cm
Capacity : 1.2 liters
[$, £, CHF...]