Possible Clues:

• Way to access a rock venue?
• His fate disheartened men working in part of pit
• Explosives on lid covering opening of first access tunnel
• He's fit: man working in tunnel underground
• Put explosives on handle and access passage
• Vertical hole he-man ruptured with fist
• Screw's foot has twisted way towards face
• Vertical tunnel
• What takes a pit crew down?
• Maths fine? Quite otherwise - one's got bored