Preheat the oven to 350°F.

Using a sharp knife, cut the bread in a checkerboard pattern, being careful not to cut to the bottom crust.

Place the grated cheeses & lobster meat between each cut.

Mix the melted butter & the ranch dressing mix. Pour over the bread. Wrap the loaf in aluminum foil & place on a baking sheet.

Bake for 15 minutes. Take out of the oven & unwrap. Bake for an additional 10 minutes, or until the cheese has melted.