Southern Navarone is honeycombed with caves, some of piled volcanic slabs. Some karst topography is evident, and the limestone is honeycombed with caves. The mountain is honeycombed with caves and is covered in many large basalt boulders. The lungs of mammals are spongy and honeycombed. These are honeycombed structures composed of calcite microcrystals arranged in a lattice. His men honeycombed the island with more than of tunnels, 5,000 caves, and pillboxes. The mirrors were constructed by Corning and used honeycombed borosilicate to reduce the weight. The Golden temple complex had honeycombed tunnel structures. The heart of the telescope is an f/1.0 honeycombed construction, borosilicate primary mirror. For instance, the Japanese had on Battle of Iwo Jima several levels of honeycombed fortifications. The receptacles are convex to conic and honeycombed. Where the urchins are numerous, the rock may be honeycombed by these excavations. An example of salt weathering can be seen in the honeycombed stones in sea wall. The Dust Ball is a honeycombed spherical cleaning robot for public spaces. The town sits on land honeycombed by coal mines.