Charley Brown penetration dive briefing:

For those divers who enjoy exploration of the interior of the ship we have several different possibilities. There are levels of difficulty ranging from entry level diver to expert wreck diver, your experience level and training will be considered before the dive. You will find that the ship is lying in the same position as shown on the schematics and the max depth is 98ft or 31m and that at the shallowest it is 50ft or 15m.
Please keep in mind that for the more technical penetrations special planning and preparation are required, schedule permitting, and there will be additional costs associated with these preparations.

On the schematic we have color coded the different possibilities.

The Highway: Color Blue
A long corridor running for over 120ft or 40m, at its widest point it is 21ft or 7m narrowing to 8ft or 6.8. Due to the fact that it is on its starboard side like in the schematic you will find that a light is nice to have but not necessary, there is ample sunlight coming through the portholes. This is a very popular route as it has an open feeling. Good for almost everyone.

The Bridge and Chart room: Color Purple
Smaller than the Highway but very interesting, as much of the navigation equipment is still in place. There is no need for a light with windows all around. Good for almost everyone.

Cable Tanks and Winch room: Color Light Green.
Slightly more challenging than the Highway, less light but still very open. Below the main deck as you go forward of the superstructure into the Cable Winch room where most of the machinery is in place, impressive to see. Not for everyone but doable for the average good diver, light recommended.

Maine Engine room: Color Yellow.
This dive is something special for the more technical diver. On this dive you will penetrate to the very bottom of the vessel (without increasing your actual depth) and then passing between the two giant Fiat main engines before heading for the exit. Additional planning and special training is required to make this dive. Not for most divers and lights are required.