Human: What is the difference between a scuba diver and an aquanaut? Assistant: 
The primary difference between a scuba diver and an aquanaut is that an aquanaut typically spends more time underwater than a scuba diver. A scuba diver generally stays submerged for about 20 minutes at a time, while an aquanaut can spend up to several hours underwater at a time. Additionally, an aquanaut may be equipped with special equipment such as diving bells or submersibles, which allow them to stay underwater longer than other divers.