  The study of top-quark production and decay is central in the LHC physics
programme, allowing precise tests of the Standard Model and offering a window
on possible new physics. Accurate theoretical predictions for this process are
therefore crucial. We report on a new calculation of the
next-to-next-to-leading order QCD radiative corrections to the production of
top-quark pairs at hadron colliders. The calculation is performed by using the
$q_T$-subtraction method to handle and cancel infrared singular contributions
at intermediate stages of the computation, and it represents its first complete
application to the hadroproduction of a colourful high-mass system at
next-to-next-to-leading order. We discuss the calculation of the additional
soft contributions needed to implement $q_T$ subtraction for this process, and
we show first numerical results.
