One ton of garbage pulled out of the waters at Hakodate

MSN-Mainichi: Volunteers clean up 1 ton of trash from bottom of Hakodate Port

Local taxi driver Toshiyuki Nagahira ironically said that Japan's economy was stable as he saw 1 ton of garbage at the bottom of the port.

"The garbage shows that the economy is brisk," Nagahira said.

This is a very unsatisfying article. I'd like to know, for example, if this cleanup effort is performed regularly, or if this was the first time. In other words, how long did it take for one ton of garbage to accumulate?

I'm glad they did some cleaning, though; Hakodate is beautiful.