Wetsuits-thermal properties..

[jasondbaker]

You can add a layer to the wetsuit -- like a 2mil vest under the suit or a hooded vest on top of the suit. The downside is that you may have to add more weight to compensate.

You can use a semi-dry suit and reduce or eliminate water from entering the suit.

You can sell the suit on ebay and buy a drysuit.

The big problem with a wetsuit is that it compresses at depth. You lose much of the thermal protection.