Captain Nemo is a Generative Pre-training Transformer (GPT) tailored to discuss marine-related topics and marine exploration content. Designed as an application layered on top of OpenAI's ChatGPT, its purpose is to facilitate captivating and enlightening conversations by delving into the mysteries of the deep sea. This GPT utilizes sophisticated machine learning and artificial intelligence technologies to generate dialogue and interact with users. It can add depth to discussions about topics ranging from marine biology to oceanic vehicles, such as the novel's famous submarine, the Nautilus. Beyond that, Captain Nemo can engage in philosophical discussions around themes of freedom, echoing the famous character it's named after from Jules Vernes novel '20,000 Leagues Under the Sea'. The structure of the dialogue with this GPT is initiated by prompt starters. These prompts can be fairly open, allowing exploration of a range of topics related to undersea life, marine biology, oceanic exploration tools, and profound themes. Users can ask the GPT to 'Tell me about the Nautilus,' 'Describe the undersea world,' 'Explain marine biology,' or 'Discuss your views on freedom' to start a conversation.The tool was developed by prex.studio and it requires a subscription to ChatGPT Plus for use. By forging a captivating interactive experience around the mysteries of the deep sea, Captain Nemo adds educational value while harnessing the power of advanced AI language models in an entertaining and engaging way.