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What a fascinating question!

Deep-submergence vehicles are indeed crucial for underwater exploration, and there are several notable ones that have made significant contributions to our understanding of the ocean. Here are some examples:

1. DSV Alvin: A deep-submergence vehicle operated by the Woods Hole Oceanographic Institution, Alvin is a manned submersible that has been used for numerous scientific expeditions, including the discovery of the Titanic wreck. 1
2. HOV Deep Sea Challenger: A one-person human-occupied vehicle (HOV) built to descend to and explore the deepest places in the ocean, the Deep Sea Challenger has reached depths of over 35,000 feet. 2
3. REMUS 6000: An autonomous underwater vehicle (AUV) designed for deep-sea exploration, the REMUS 6000 can dive to depths of up to 6,000 meters (19,685 feet). 3
4. Triton 36000/2: A deep-diving submersible capable of reaching depths of up to 36,000 feet, the Triton 36000/2 is designed for scientific research and exploration. 4
5. Nereus: A hybrid remotely operated vehicle (ROV) designed for deep-sea exploration, Nereus has reached depths of up to 36,000 feet. 5
6. Sea Cliff: A deep-submergence vehicle operated by the US Navy, Sea Cliff is a crewed deep-ocean research submersible. 6
7. Hadal Manned Submersible: A deep-diving submersible capable of reaching depths of up to 36,000 feet, the Hadal Manned Submersible is designed for scientific research and exploration. 7

These are just a few examples of the many deep-submergence vehicles used for underwater exploration. Each of these vehicles has contributed significantly to our understanding of the ocean and its ecosystems.

Here are some images of these vehicles:

Image 1: DSV Alvin Image 2: HOV Deep Sea Challenger Image 3: REMUS 6000 Image 4: Triton 36000/2 Image 5: Nereus