Air Bubble
noun
きほう
泡 (あわ) Bubble, Foam
気泡 (きほう) Air Bubble
水泡 (すいほう) Foam, Bubble
発泡 (はっぽう) Foaming
空気 (くうき) Air, Atmosphere, Mood
Air Bubbles leaked out of the key き hole ほう when the treasure chest sank.