We show the experimental observation of SERS inside metal nanoshells for the first time. Giant enhancement, solely due to the electromagnetic enhancement in the I near field and on the order of 10(11) to 10(14), can be consistently and reporducible achieved. The results provide new insights to the SERS effect and pave the way for a new design of nanostructures to be used as SERS-tags for Raman-based assays and imaging.