What is the first step in managing a diver with in-water DCS?

In managing a diver with in-water decompression sickness (DCS), the first step is to launch standby to assist. This action is essential as it ensures that additional support is on the way and that the affected diver receives help quickly. Having a standby diver ready can facilitate a safe and rapid response, allowing for the implementation of further emergency measures.

Once standby is launched, other steps like switching the diver to 100% oxygen or preparing to assist with a controlled ascent may follow, but the immediate priority is ensuring that help is available. Given the dynamic environment of diving, having a second diver readily available helps enhance safety and manage the situation more effectively. It serves as a precautionary measure to address potential complications that might arise from the diver's condition during the initial response phase.