[jcsp]

I am in no means Trimix qualified so take this with a pinch of salt.

The Helium in Trimix allows you to reduce the effects of the other gasses as Helium will be mixed with both Nitogen and Oxygen.

In Trimix O2 usually has to be added to set the percentage of O2 desired.

So as such it allows you to pick your equivilant air depths as with Nitrox, there are just more Variables.

Due to the cost of O2 and Helium trimix can be expensive.

My advice to you would be to set these wrecks as goal targets and get experience using Nitrox, as both back gas and deco gasses. There is a difference using it in training circumstances and none training circumstances.

As to begin with I believe you will be using "tables" and run times I think it would be advantageous to start writing small dive plans on a slate and use them so you can get used to it.

The information on a slate gives you a maximum depth you can go to and how long to stay there. Followed by the deco obligations required and the ascent speed.

I seem to remember that a certain 10m/min ascent rate would be good to practice both with and without dsmb's from what i have heard.

Dive within your limits and to build up to the qualified depths, remember the wrecks wont go anywhere but you may.

Forgive me if this is inapropiate but what sort of skill level are you. eg Dive Leader/Master. And how many dives have you done?

Trimix like Nitox can be a safe gas but it can also bite you in the ass. The particular bite being bigger due to the depths usually involved with trimix.