Can you explain your experience with using specialized materials, such as fiber-reinforced polymer or corrosion-resistant alloys, for drain repairs in highly corrosive or aggressive environments?

How do you handle situations where drain repairs require working in extreme climates or harsh environmental conditions?

Have you ever had to repair drain systems affected by complex geological conditions, such as sinkholes or underground mine collapses? If so, how did you approach the work?

Can you describe a time when you had to work on a drain system affected by a catastrophic event, such as a terrorist attack or major explosion?

How do you handle situations where drain repairs require working in highly sensitive areas, such as military bases or government facilities?

Are you familiar with using advanced technologies, such as sonar or ground-penetrating radar, for drain inspections? If so, can you explain the process?

Can you explain your approach to ensuring proper drainage and slope in drain systems designed for large-scale infrastructure projects, such as airports or stadiums?

How do you handle situations where drain repairs require working in remote or offshore locations, such as oil rigs or maritime vessels?

Have you ever had to repair drain systems affected by structural collapses, such as building collapses or bridge failures? If so, how did you approach the work?

Can you describe a time when you had to work on a drain system affected by a major environmental disaster, such as an oil spill or chemical release?