A sinister-looking army of robots may soon be crawling through your water pipes. The so-called spider robot "SPD1" is designed to sneak into houses on reconnaissance missions. However, the multi-legged machines have only be designed to carry out maintenance surveys and spot leaks. Equipped with 360 degree camera, operators are able to control them with a gaming pad. Japanese robotics firm TMSUK say they have developed the bot as a response to failing sewer infrastructure and a lack of workers. They say the "walking pipe survey robot" was developed in consideration of the deterioration of sewer pipes since the 1970s. The company explain: "The total length of sewer pipes in Japan is about 490,000 km, of which about 25,000 km (5% of the total length) have passed the standard service life of 50 years, and will be expected to reach the end of the next 10 years. "In addition, there is a chronic shortage of workers in the construction industry, especially at sewerage construction sites, and it is currently difficult to expect inspections and repairs to be completed. "Therefore, as a new attempt to meet the diverse needs that are expected to continue to increase in the future, we have developed a highly versatile multi-legged walking pipe survey robot." SPD1 features legs designed to flexibly conform to different inner diameters of the pipes. The robots can investigate and work individually or in groups; with the first robot leading the way, the second robot recording the surveyed location, and the third robot doing "works" on the required location. TMSUK say: "We are planning to announce the product model of SPD1 after conducting a demonstration experiment at the site of a sewage pipe survey. "In addition, since it is based on general-purpose robot technology, by changing functions such as adding a workable arm, it can be applied to survey and work in narrow places where people cannot enter, other than sewage work."