By saying that its small I mean , if you want to go down deep into the hole or abyss you need a very manueverable sub that can go down in a hurry. Most of the big ones cant do it. For the big ones there is plenty of room to run around near the surface.
Here she is going vertical at a nice easy pace. I went full speed on one of the ascents and it almost left the water but not comepletely. If I could have gone deeper and had more room to build up speed it would have done better but the shape of the abyss there is narrow down deep so I erred on the side of caution and only went down about 20 feet.
With my sub set up in the wild I could easily go up or down at will like an elevator with the sub horizontal or driving it up and down vertically.
vertically scalling the wall. I bumped into the wall one time. How careless of me! 
My friend Alnuci turned me on to a good idea. He puts a sponge in his WTCs so that if a small amount of water gets in(not too much) the sponge will soak it up and it cant do any harm. In horizontal operation a small amount of water in there will just stay on the bottom of it and never touch any of the electronics. But when you go vertical not only will it get all over everything in there but on the WTCs that have a conduit leading to the front section, water will go thru it and get in there as well.
His other Nautilus is about the same size and is pump jet propelled and is set up for dynamic diving.
Good operating procedure, the traditional Z cut.
The new working front dive planes. It gives the boat better control yet they easily remove for scale like appearance for display.
The large ballast tank in the background and the battery WTC in his hands.
Dave Santivanez(aquadeep) modified a Graupner shark with a LIPO and Yee Hah does it move. Like a zooped up torpedo!!
Well it wasnt long before it Zooped right into the wall and stuck there like an arrow in a target.
Look here at the clever stop action photography( Thank you, thank you) of Dave going in after the marooned shark. He plays the part of "Aquaman" very well. There were multiple instances where he had to go in after the shark. One time it actually went up into the mouth of the head spring and he had to go in after it.
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