Final answer:
When suspecting decompression sickness (DCS) in yourself or another diver, it is important to activate the Emergency Medical Service (EMS) system and contact the Divers Alert Network (DAN). DCS can be a serious condition that requires medical intervention in a recompression chamber, and EMS and DAN can provide the necessary assistance and guidance.
Step-by-step explanation:
When suspecting decompression sickness (DCS) in yourself or another diver, it is important to take immediate action. The correct course of action would be to activate the Emergency Medical Service (EMS) system and contact the Divers Alert Network (DAN). Both options are necessary because DCS can be a serious condition that requires medical intervention in a recompression chamber, and EMS and DAN can provide the necessary assistance and guidance.