pression ▁chamber ▁for ▁type ▁ 1 ▁decom pression ▁sick ness , ▁states ▁" Des cent ▁rate ▁- ▁ 2 0   ft / min . ▁As cent ▁rate ▁- ▁Not ▁to ▁exceed ▁ 1   ft / min . ▁Do ▁not ▁compens ate ▁for ▁slower ▁as cent ▁rates . ▁Comp ens ate ▁for ▁faster ▁rates ▁by ▁hal ting ▁the ▁as cent ." ▁ ▁To ▁further ▁comp licate ▁the ▁practice , ▁the ▁as cent ▁rate ▁may ▁vary ▁with ▁the ▁depth , ▁and ▁is ▁typically ▁faster ▁at ▁greater ▁depth ▁and ▁reduces ▁as ▁the ▁depth ▁gets ▁shall ower . ▁In ▁practice ▁a ▁continuous ▁decom pression ▁profile ▁may ▁be ▁approxim ated ▁by ▁as cent ▁in ▁steps ▁as ▁small ▁as ▁the ▁chamber ▁pressure ▁gauge ▁will ▁resolve , ▁and ▁tim ed ▁to ▁follow ▁the ▁theoretical ▁profile ▁as ▁closely ▁as ▁convenient ly ▁pract ic able . ▁For ▁example , ▁US N ▁treatment ▁table ▁ 7 ▁( which ▁may ▁be ▁used ▁if ▁decom pression ▁sick ness ▁has ▁re oc cur red ▁during ▁initial ▁treatment ▁in ▁the ▁compression ▁chamber ) ▁states ▁" De com press ▁with ▁stops ▁every ▁ 2 ▁feet ▁for ▁times ▁shown ▁in ▁profile ▁below ." ▁The ▁profile ▁shows ▁an ▁as cent ▁rate ▁of ▁ 2   f sw ▁every ▁ 4 0   min ▁from ▁ 6 0   f sw ▁( fe et ▁of ▁sea ▁water ) ▁to ▁ 4 0   f sw , ▁followed ▁by ▁ 2   ft ▁every ▁hour ▁from ▁ 4 0   f sw ▁to ▁ 2 0   f sw ▁and