The mooring single pipe (pipe) installed at the current mooring place rusted near the water surface
      There are three places that have broken. I was supposed to do the removal work after
       the water temperature rose, but today is a great opportunity.
      Leading by the chairman who was active as a diver overseas, 
      we cooperated to pull out the broken single pipe from the bottom of the river. 
      The removed single tube was cut short in the workshop and discarded.
       He shook the iron pipe stuck in the bottom of the river in the water
        and pulled it out little by little. I don't think it's a human skill.