A scuba diver releases a balloon containing 175 L of helium attached to a tray of artifacts at an underwater archaeological site. When the balloon reaches the surface it has expanded to 395 L. The pressure at the surface is 1.00 atm. What is the pressure at the underwater site? Pressure increases by 1.0 atm for every 10 m of depth. At what depth was the diver working? Assume the temperature of the helium did not change.
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