Thus, even as companies scramble to improve safety, most of the research and development in the ultra deep will focus on saving money and energy. Remotely controlled, steerable drill heads, for example, allow companies to drill multiple bores from a single platform (thus lowering costs and the aboveground footprint) and to follow the path of narrow oil seams, greatly increasing oil output. (The record for a horizontal bore, set by Exxon near Russia's Sakhalin Island, is also about seven miles.) To further cut drilling costs, companies will steadily boost rates of penetration with more-powerful drill motors, drill bits made of ever-harder materials and, eventually, a drilling process that uses no bits at all. Tests at Argonne National Laboratory suggest that high-powered lasers can penetrate rock faster than conventional bits, either by superheating the rock until it shatters or by melting it.