It seems logical now, that the steps to follow for understanding the mechanics behind creating a dive plan for 180ft DEEP starts with (1) calculating how much psi required at depth 180ft for, say 10 minutes, using SAC or RMV (2) descending time and psi required, using ATA at depth (3) ascending time and psi required, using staged deco stop times, (4) temperature at depth, and proper thermal protection needed, using temp, current, and activity SAC or RMV (5) tank size needed, the need for double tanks, bc, sling bottles, tanks with various MIX, dive computers that can track changes to MIX (6) and the mixture of gas required (because 180ft is DEEP,) at different levels (stage bottles.)
I have put together a rough idea in my mind, on the above. I now feel comfortable as to the SCOPE of the task. Furthermore, I am now sure this DEEP dive is absolutely not a JOKE dive. Not sure if I can meet the physical challenges.