Within severely constrained financial budget, mass and energy allocations as well as reliability needs, the Huygens Probe to Saturn's satellite Titan raised the need to design, develop and validate many new subsystems.Among them are very high-temperature-protection materials and a shell/kernel operative concept that allows to eliminate all ablated contaminants immediately after entry, space and gaseous (−200°C-convection) thermal control without heaters, hyper- and transonic parachutes, numerical transponders….These new developments are presented in relation with the low-cost, quick-development (fixed launch window) and robustness need of the Huygens program.