I'm designing a scuba-diving expedition in the Permian sea Panthalassa. Pre-dive planning for the optimal gas mix and critical pressures requires factoring in gas available but also readings on the environment. In terms of composition, it appears that Permian seawater is virtually identical to that of the modern ocean, according to this study. However, the Permian ocean temperature was notably higher than the modern ocean (80°F+/26.7°C+ versus 60.9°F/16.1°C). This would predispose divers to overheating more, perhaps, but this isn't that special when examining regional differences in today's oceans.
It sounds so well and good, but the similarities actually undermine things. I want special boutiques of diving companies to offer diving solutions specifically for swimming in the Permian seas.
- I had imagined their value-add to be mostly in the form of cost-savings: maximize dive time given volume of gas.
- Their knowledge of the world was supposed to afford them an edge over normal scuba companies who just use conventional gas mixes and critical pressures.
Clearly, the issue is that if conditions are more or less the same, then anyone with diving expertise would be able to design pre-dive plans for the Permian seas. To them, the Permian would just be a new location where all the old rules apply. I definitely don't want that for my world.
Granted there will be regional/location differences (just as there are in today's oceans), but based on empirical findings, is there universally unique about the Permian seas that would prompt adjustments of 'present-day' calculations of gas mixes and critical-pressures?