深

The EIGHT WOODen instruments are COVERed with WATER, <deep> down on the o[cean] floor, explains Laura.
by vms5q

the wood is 8 deep covered in water
by megaman2400

Lower the bucket deep into the well to retrieve water
by Killua

Người xưa dùng khúc gỗ cắm xuống để đo độ sâu so với mặt nước
by huiheruan

Cover the water with 8 woods to make it look DARK !
by Geoffroy