you cannot do anything higher than +1
also 1 atm is probably 101.546 PA not 100.000
pressure increases 1 atm every 10 meters, 1 atm = 100.000 pa, bob PA = 3.109.000 PA, mariana trench = ~12k meters (1200 atm) 1200 atm = 120M PA (120.000.000 PA > 3.109.000 PA) i may be wrong