  A bright feature 100 pc away from the core in the powerful jet of M 87 shows
mysterious properties. Earlier radio, optical and X-ray observations have shown
that this feature, labelled HST-1, is superluminal, and is possibly connected
with the TeV flare detected by HESS in 2005. To examine the possible
blazar-like nature of HST-1, we analyzed 2 cm VLBA data from dedicated
full-track observations and the 2 cm survey/MOJAVE VLBI monitoring programs
observed from 2000 to 2008. Applying wide-field imaging techniques, the HST-1
region was imaged at milliarcsecond resolutions. Here we present the first 15
GHz VLBI detection of this feature and discuss the connection between our radio
findings and the TeV detection.
