Dear Santa, Onboard diesel generator driver the outboard electric too and from the drive site. When in the dock, or storage, the diesel generator will keep the batteries charged. K350 with two foot extra length in the pressure-hull and 22 feet of over length, two foot extra long battery pods. Static thruster for vertical movement (one front, one rear), as well as VBT. One static thruster (front), and directable rear main thruster for side to side movement. Rear end cap has a bolt on flange to so the diesel genny can easily be removed for repair/replacement. The viewport housings in strange places (front end cap upper section and rear end cap lower section) are for metal disks with different thru-hull fittings (so I can ask you for a robot arm option next year and you don't have to do any welding). Take care, Ian.