NASA is seeking information on capabilities and recommendations for conducting multi-day hypobaric chamber studies to assess the physiological and cognitive risks of mild hypoxic atmospheres for future space missions. The request focuses on identifying facilities that can house 6 people for 7 to 30 days in controlled low-pressure environments and can recruit astronaut-like participants. This is a Request for Information (RFI) for planning purposes only, and it does not constitute a formal solicitation or guarantee future work. No specific budget, performance location, or submission timelines for a potential future contract are provided in this description.