I've been chipping away at a deep-sub model in C4D. It is equipped with a screw top that can be opened from both the inside and outside, making it easy to access the interior. It also has a propulsion motor at the back to thrust it forward, but I'm still working on adding smaller motors for vertical dexterity. To top it all off, the sub is fitted with two harpoon launchers that can be used to drag things towards it.

There are some additional details that I may add in the next pass

• I may opt for a single harpoon launcher in the front.
• The sub could have a powerful searchlight to illuminate the abyssal darkness.
• Some kind of sonar system to detect objects when the searchlight fails.
• Sub could be made of titanium