WATER TANK APPARATUS

IN A WATER TANK APPARATUS , AN ATTACHED WATER TANK MADE OF A TRANSPARENT MATERIAL AND HAVING AN OPEN UPPER END IS ATTACHED TO A PERIPHERAL WALL OF A LOWER PORTION OF A GAS-TIGHT WATER TANK BODY MADE OF A TRANSPARENT MATERIAL, WHICH IS PROVIDED WITH A DECOMPRESSION UNIT FOR DECOMPRESSING A SPACE WITHIN THE WATER TANK BODY, SO THAT THE ATTACHED WATER TANK COMMUNICATES WITH THE WATER TANK BODY. OPERATION DUE TO THE DECOMPRESSION UNIT ENABLES A WATER LEVEL WITHIN THE WATER TANK BODY IS RAISED TO A PREDETERMINED LEVEL, WHILE A WATER LEVEL WITHIN THE ATTACHED WATER TANK IS LOCATED BLOW THE WATER LEVEL WITHIN THE WATER TANK BODY. THUS, AN ENJOYER CAN ENJOY FISHES AND SO ON WITHIN THE ATTACHED WATER TANK FROM THE ABOVE, OR CAN DIRECTLY TAKE AN ACTION SUCH AS FEEDING OR THE LIKE. FURTHER, A TUNNEL MADE OF TRANSPARENT MATERIAL IS PROVIDED AT AND WITHIN A LOWER PORTION OF THE WATER TANK BODY. THE TUNNEL HAS ITS BOTH OPEN ENDS, COMMUNICATES WITH THE OUTSIDE AND IS PROVIDED WITH A COMMUNICATION OPENING WHICH COMMUNICATES WITH THE SPACE WITHIN THE WATER TANK BODY. THE OPERATION OF THE DECOMPRESSION UNIT ENABLES THE WATER LEVEL WITHIN THE TUNNEL TO BE REDUCED LESS THAN THE WATER LEVEL WITHIN THE WATER TANK BODY. THUS, IT IS MADE POSSIBLE FOR THE ENJOYER TO FREELY WALK AND TAKE A WALK WITHIN THE TUNNEL UNDER THE ATMOSPHERIC PRESSURE. THE ENJOYER CAN OBSERVE THE ECOLOGY OF THE FISHES OR THE LIKE FROM THE TUNNEL.(FIG 7)