"The conditions inside a tank is always less than pleasant, it is loud, claustrophobic, and often permeated with nauseating odors of sweat, piss, gun smoke, exhaust, lubricating oil and fuel."
As a 20 year tanker your speaking about less than pleasant conditions is not really an issue. I distinctly remember the smell of FRH, oil, grease and deisel. The real issue is with space. It gets cramped and you need a break sometimes. Riding topside, hazardous as it is, allows you to stretch out and see some scenery you wouldn't normally see.