A scuba diver releases a balloon containing 155 L helium attached to a tray of artifacts at an underwater site. when the baloon reaches the surface it has expanded to a volume of 355 L. the pressure at the surface is 1.00 atm. what is the pressure at the under water site? Pressure increases at 1.0 atm for every 10 m depth; at what depth was the diver working. Assume the temp remains constant.