Microsoft wants you to “Get Wet” during the week of January 31st.  Gold Members will be able to purchase three water-themed games for up to 50% off.  Aqua and Hydrophobia will be discounted to 400 Microsoft Points, a savings of 50%.  Hydro Thunder Hurricane will cost 800 Microsoft Points, a savings of 33%.  The sale will run for a week and is only open to Gold Members.  All games are relatively new and have been released in the last year.

Check out http://majornelson.com/ or Xbox.com for more details.  Official descriptions of games from Xbox.com:

Aqua

Follow the story of Captain Benjamin Grey and his trusted fellow engineer Polly Edison in their struggle to save the Aqua world from a treacherous conspiracy, pulling the strings behind a massive conflict of two rivaling naval empires... Try out new ship types, weapons and upgrades and perfect your tactical skills with four different squad types. The full game also contains single-console multiplayer cooperative and competitive modes on six different maps.

Hydrophobia

Hydrophobia™ is a third person survival adventure set in a floating city, where terrorists take control and heroine Kate has to overcome her haunting childhood memories and fight back using all her skills and expertise as a systems engineer. Hydrophobia offers fast-paced action and breathtaking visuals; engage in mind blowing “flow combat” where emergent gameplay results in a never-the-same-experience. Unleash floating oil fires, electricity and the power of the water itself to wipe out your enemy as you discover the terrifying truth of the Malthusian agenda; Save the World, Kill Yourself.

Hydro Thunder

This all-new sequel to the legendary arcade hit features amazing dynamic water physics, transformable rocket-powered boats, gorgeous visuals and over-the-top interactive environments. Single player games include Race and Championship, and two brand new modes: Ring Master and the explosive Gauntlet. Combine local 4-player split-screen and online multiplayer games with 8 players over Xbox LIVE.