I haven't used these people before but here is a link
http://www.deepbluedivecharters.com/
Deep Blue Dive Charters
Owner/operator: Lee Brumlow, USCG Licensed Captain, PADI Advanced Open Water Diver for 9 years, with over 250, logged shipwreck and oil rig dives. I do this because I love to dive. I will be in the water with you.
Service Provided: Shipwreck and oil rig diving out of Freeport and Matagorda (Colorado River) Trips vary from 20-50 miles offshore depending on the water/weather conditions. Trips depart at 5:00AM and are generally an all day affair.
Depth of Water: 60-125 feet
Boat: 35 foot Chris Craft Scorpion with twin 300hp outboards. Average speed is 25- 35mph. This is an open boat, no head, no a/c, no frills. The boat does have a small cabin in case someone wants to lay down. And the boat does have a Bimini top for sun protection.
Skill Level Required: Beginner/Intermediate to Advanced Open Water. Depending on the skill level of the group the captain will decide the best dive sites. Visibility and current vary greatly and the goal is to find the best dive site with safety being the first priority.
What you can expect: Water temperatures between 80-90 degrees most of the time. Typical oil rig dives last 25-45 minutes depending on your depth. It is common to see 1000 or more fish in a single rig dive. I can almost guarantee you will see Bottle Nosed Dolphins. And if you are lucky you may see large Rays, turtles and maybe even a Whale Shark. The boat is not a ship so expect it to be in a rocking environment most of the day. Dramamine or the Patch is highly encouraged.
Weather: Weather is the biggest factor determining if it is safe to make a dive trip offshore. The captain will make a decision the day before and again on the morning of departure. Approximately 50% of all scheduled trips are cancelled due to weather conditions. The best months are July, August and September and we try year round.
Diving Equipment: Bring your own. Tanks are available. Spearfishing is optional.
Rates: $115.00 per person. This is a minimum and includes 2 full tank dives. $35.00 per person for a 3rd full tank dive. NOTE: 3rd dives are optional depending on customer, conditions and time. Tanks are available for $12.00 ea.
Reservations: Trips are available all year round. All trips must be reserved at least2 weeks in advance. A $75.00 deposit will hold your spot. Deposits must be received at a minimum of 1 week before departure. Deposits are not refundable unless requested 3 weeks prior to departure (this ensures that the remainder of the group gets to dive, even if 1 or 2 people elect not to go at the last minute).