Hi @eric84200 -
Your best bet is to check out the older, non-locking 3D cad files, and use the free under-pressure software to design for your target depth! The 3D cad data sufficient to manufacture the locking-cord tube enclosures currently sold is not available, models sufficient for planning your design are all that is available on the product pages.
Are you making a drop camera? What are you hoping to see at 3000m? Have you heard of Blue Robotics similar efforts with Ocean Discovery League, and the DORIS platform? It was documented in National Geographic! Eventually a low-cost line of 6000m rated enclosures should be available thanks to this development work…