To cope with the changing water column height, and yet prevent the islands from bunching up on one side, we have used a pulley and leash system as roughly drawn below:

 

 

Island

 

Volcano edge, with access gate and cable lock-off points

 
H2O

 

 

 

 

 

 

 

 

 


The anchor cable has extra length to enable us to release it and draw the islands (via the ‘leash) to the edge for expected annual and ad hoc maintenance.