Preheat the oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.

In a mixing bowl, combine the chocolate cake mix, water, vegetable oil, and eggs. Mix until smooth.

Pour the batter into the prepared cake pan and bake for 25-30 minutes or until a toothpick comes out clean.

Allow the cake to cool completely in the pan before removing.

Once the cake is cooled, slice it in half horizontally to create two layers.

Place one layer of the cake on a serving plate. Spread half of the softened vanilla ice cream over the cake layer.

Add the second layer of cake on top of the ice cream. Spread the softened chocolate ice cream over this layer.

Cover the cake with plastic wrap and freeze for at least 2 hours to firm up.

Remove the cake from the freezer and take off the plastic wrap.

Spread whipped cream over the top and sides of the cake.

Drizzle chocolate syrup over the whipped cream for decoration.

Slice and serve immediately.