  A new type of cosmic-ray experiment is under construction in the Pyh\"asalmi
mine in the underground laboratory of the University of Oulu, Finland. It aims
to study the composition of cosmic rays at and above the knee region. The
experiment, called EMMA, will cover approximately 150 square-metres of detector
area. The array is capable of measuring the multiplicity and the lateral
distribution of underground muons, and the arrival direction of the air shower.
The full-size detector is expected to run by the end of 2007.
