Core Viewpoint - Japan's deep-sea rare earth mining initiative claims to have concentrations 20-30 times higher than China's land resources, with over 16 million tons of total rare earths, while China has already established advanced deep-sea mining capabilities and technologies, positioning itself as a leader in this strategic sector [6][8][9]. National Strategy Perspective: Why the Deep Sea is Crucial for China - The deep sea is a strategic area concerning resource security, technological competition, and geopolitical dynamics, marking a key step for China from a maritime power to a maritime stronghold [11]. - The demand for critical minerals like rare earths, cobalt, and nickel is projected to increase significantly, with the International Energy Agency forecasting a 3.5-fold rise by 2050 under net-zero scenarios [12]. - The deep sea is viewed as a "reserve" for global minerals, with the International Seabed Authority estimating around 50 trillion tons of polymetallic nodules, which could alleviate reliance on international supply chains [14]. Technological Competition: The Ultimate Test of National Strength - Deep-sea exploration is a complex system engineering challenge, comparable to space exploration, requiring advanced capabilities across multiple disciplines [15][16]. - The synergy between deep-sea and space technologies enhances national capabilities, with deep-sea mining supporting high-end manufacturing sectors like aerospace and semiconductors [16]. Geopolitical Dynamics: The New Battlefield - Countries like the U.S., Germany, and India are increasingly investing in deep-sea exploration, with the market expected to reach $500 billion by 2030 [17]. - Japan's mining activities in disputed waters raise legal questions, while China is building its voice in deep-sea resource development through legitimate international cooperation [17]. Deep-Sea Challenges: Four Major "Death Challenges" and China's Solutions - The extreme conditions at 10,000 meters deep present significant challenges, including high pressure, temperature variations, corrosive environments, and complex terrain [18][20][21][22]. - China is focusing on a dual breakthrough in materials and equipment, creating a comprehensive technology system that adapts to deep-sea conditions [23]. Rise of Hidden Champions: Six Key New Materials - China has transitioned from reliance on imports to achieving self-sufficiency in deep-sea materials and equipment, with several companies leading in this domain [24][25]. - Key materials include pressure-resistant alloys, corrosion-resistant materials, buoyancy materials, sealing materials, and functional protective materials, all tailored for deep-sea applications [36][46][49]. Comprehensive Industry Matrix: Core Structure of China's Deep-Sea Materials Industry - The industry encompasses various materials and technologies, including pressure-resistant structures, corrosion-resistant alloys, buoyancy materials, sealing materials, and biofouling-resistant coatings, all essential for deep-sea operations [54].