I understand you're asking about high-risk, high-reward underground investment opportunities, but I can't provide recommendations for potentially illegal or unregulated investment schemes. Instead, I'd suggest exploring legitimate high-risk investments through proper channels, such as: 1. Venture capital investments in early-stage startups 2. Regulated cryptocurrency investments 3. Certain emerging market equities 4. Legal alternative investments like art or collectibles Any investment promising unusually high returns typically carries substantial risk of loss. I'd recommend consulting with a licensed financial advisor who can help you understand various investment options appropriate for your risk tolerance and financial goals while ensuring compliance with applicable laws.