Combine water and yeast in mixing bowl. Allow to rest for 5 minutes.
Add the molasses, olive oil, salt, cocoa powder, bread flour, and rye flour to bowl.
Using the dough hook, slowly combine ingredients to form a soft dough.
Cover with a tea towel and rise dough for 90 minutes.
Punch the risen dough and remove from the bowl onto a lightly floured surface.
Stretch dough into a rectangle and roll into a loaf. Pinch the sides and edges to create a smooth log.
Place the bread dough into a buttered loaf pan, cover with the tea towel, and allow to rise for 1 hour.
After the second rise, the dough should be risen slightly above the rim of the bread pan.
Preheat the oven to 350 degrees.
Bake the loaf for 35-40 minutes, or until internal temperature is above 190℉.
Cool on a wire rack for 5 minutes before removing from bread pan. Finish cooling on the wire rack for 1 hour before cutting.