Yes, different pay for different regions.
3rd world regions like Gulf of Mexico, North Sea etc pay a lot less than Australia (unless you work for OI in Australia where you’re screwed anywhere, their Superintendents earn less than an average PT for any other company working in Australia). Asia also better than ME or North Sea/GOM on average but it depends on the individual/employer
GOM also tends to be on an hourly rate i.e. wages as opposed to a flat day-rate. McDonalds workers in Australia do indeed earn more than ROV workers in the GOM.
Tax is a total beat-up; even paying 47% tax it’s still possible to clear more than the gross wages in GOM and I don’t even have to prepare for the end of days, rapture, buy ammo or any of that other senseless expenditure!
Enjoy 😉