195. While taking on fuel oil from an offshore supply vessel, the transfer hose leaks, causing a sheen in the water. Which action should you take FIRST?

Immediately cease fuel transfer operations to prevent further pollution. Regulations prohibit oil discharges causing sheens and require the ability to rapidly stop transfers in case of leaks. The priority is always to stop the source of the discharge before any other action is taken; attempting repairs or reducing the transfer rate allows the spill to worsen and violates regulations.