Beach Drumming

I have been down the beach at least three times this week doing a few swim laps. Today I started at the other end as the wind was coming from the West so I got a slight push.  We have observed various items on this beach over the last few years such as garden furniture, a trampoline and broken camping gear. I always suspected one group and now I think I have seen them. Three days ago as I was leaving, there was a group coming down the hill carrying what I thought was a raft. It was bulky and heavy and at least 5 big guys were transporting it. There were 44 gallon drums and two pallets lashed together. I had to get off the path so they could pass.  A woman was ahead of them and she goes to me  "Those boys".  So today I spy a row of drums lining the back of the beach at the vegetation boundary.  I didn't see any pallets. What does it mean?  Did their raft break and they just left their crap behind again? 

One thumb One thumb drumming on a Drum