Tunnel Bore | Technic Pack Wiki | Fandom
Cannot mine Obsidian. Mines each layer 20% faster than the Iron Bore Head. A Diamond Bore Head can bore 6000 blocks before breaking and can mine Obsidian. This is enough to dig a tunnel nearly 700 tiles long. You'll run out of rails before the head breaks. The Bore can only hold 576 rails at a time. Three diamond pickaxes can only mine about ...