Karachi is located on southernmost border of Pakistan along the Arabian Sea coast. Concerned institutions fear the occurrence of subsidence in the city, further contributing to the relative sea level rise. No direct measurement has been made so far about the subsidence rate and its contribution to city's submergence risk. Our study presents first and preliminary results of vertical ground deformation measurement over this area using an advanced Temporarily Coherent Point InSAR technique using Envisat/ASAR and Sentinel-1A data. These datasets allowed us to study deformation in this area from 2004-2016, with some data gaps, thus providing a long-term analysis. Results show that various parts of the city are unstable and undergoing deformation of up to about 15 mm/yr. However, we could not find significant correlation between faults passing through the city and the deformation in its different parts. Future studies should focus on monitoring the deformation on a regular basis.