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I would consider creating it as a multipatch with the Layer to 3d Feature tool. To complete the look you may need a cylinder for the 'tunnel' and then another extruded multipatch for the entire area. With the Difference 3d Tool, you can clip out the portion to create the 'tunnel.' That would be a coarse description, but I think it would be the start. As you make the tunnel and the original surface more complex the better the new one will be.
Perfect, Thanks for your help.I have never worked with that tool, I am going to try it now.
Once you have created the multipatch and you need to add more detail you can export to Collada then import to Google SketchUp (free 3D modelling software). Once you have added some realistic features and textures you can use the ArcScene editor to replace the model which will swap the edited model with your existing multipatch.