A flexible steerable device comprising a plurality of interconnected segments configured to pivot relative to each other, each of the plurality of segments having a cavity disposed therein. The recessed portion has a volume in the range of 0. A control system 30 allows the required humidity level to be set, and is connected to the humidity sensor 28 to receive a signal indicative of the humidity within the incubator, and is also connected to the humidifier 2 to operate the humidifier to maintain the humidity within the incubator at the set level. The reactor effluent stream may be treated to convert acetylene to another hydrocarbon process. The interconnects can extend through the cover or along a surface of the cover.