What additional precautions should be taken when making temporary repairs to a MODU that is operating when hydrogen sulfide is present?

Correct Answer: Option A — Provide respiratory protection and monitoring.

High-strength steels are particularly susceptible to sulfide stress cracking (SSC) when exposed to hydrogen sulfide. This brittle failure mechanism can lead to catastrophic structural failure of critical drilling components. Engineers must select materials with appropriate hardness and metallurgical properties to resist hydrogen embrittlement in sour gas environments.