Preheat the oven to 180 degrees C. Grease and flour one 23cm cake tin or a 25cm ring tin.
In a large bowl cream the butter with the sugar. Beat in the eggs then add the water and the vanilla.
Stir the flour, cocoa, bicarb soda, ground cinnamon and ground nutmeg together. Beat this mixture into the creamed mixture. Stir in the chopped apples and the dark chocolate chips. Pour the batter into the prepared cake tin.
Bake in the preheated oven for 1 hour and 15 minutes or until the cake tests done when a toothpick is inserted near the centre. Transfer to a rack to cool.