Double Action Dive Charters runs out of Hammond Marina in Hammond, IN in the same general area as the Casino. However, it's not exactly obvious once you get to the Casino area.
*Click on map above for bigger version
From Chicago...Turn right at the giant "Horseshoe Casino" sign
Follow around and over the bridge
As you come down the ramp off the bridge there will be a small brown sign that says "Marina ->" make a sharp right turn / u-turn
Follow the road all the way back to the Guard Gate
Tell the guard you are here for Double Action Dive
He will hand you a pass for your dash and point you to make another U-Turn
Go past the Marina Port Building and park in the last couple rows of the parking lot BEFORE you reach the Casino itself
Once you Get There
Park as close to the Entry as possible and walk over and get a complimentary dock cart.
Put your dive stuff in the cart (including tanks)
Lock your car and walk thru the Entry and hang a quick right to the end of the first dock
Restrooms are behind me in this picture, further down the dock in a blueish small building
The Boat
Dock Entry: Port (facing forward...left side)
Water Entry: Starboard (facing forward..right side)
Water Entry Method: Giant Stride (big drop)
Water Exit: Stern ("back" of the boat)
Water Exit Method: "Christmas Tree" ladder / Fins On
Tag / Pull lines will be in the water...use them
Has a "galley" area with small tables and benches. Also has an "upper deck".