  We present high resolution VLT spectra of 2 submm-detected galaxies.
Diagnostic stellar absorption lines (Starburst99) are used to analyse their
stellar population. SMM J14011+0252 (z=2.565) shows signs of starburst and SMM
J02399-0136 (z=2.808) shows signs of starburst and AGN. A MgII line at z~0.94
is identified in the latter galaxy and could account for an extra magnification
factor in this SCUBA source.
