Sonic disc

Sonic disks ( this is possibly not their true name ) were sonic weapons devised by the Sea Devils during the time they ruled the Earth with the Silurians. They served as a kind of heat ray, capable of scorching ships and sinking them.

The Sea Devils used them when they awoke in 1972 and again in 2084. They also possessed a larger cutting device for cutting through doors. (DW: The Sea Devils, Warriors of the Deep)

The toy release of the sea devils names it as a heat ray