The diving Tug-boat!! A new classification? Sub-Tug? I "stole" this from Alturas. Hunter had found it and it's so weird and yet funny I want you too to see it. It's...well....kind of impossible..but...hehehe... Take a look. My cousin is chief for machinery on boats. I've sent him this link too and I'm very curious about his reaction on this.
oh my!! Well I don't think they will be designing tugboats to do that NORMALLY yet... Pretty exciting though!