The Sentinel-1A Optical Communication Payload (OCP), which ensures a communication link through the European Data Relay Satellite System (EDRS) to download part of Sentinel-1A data to the ground, was unavailable from 02:45:55 UTC on 16 January and 02:49:55 UTC on 16 January 2023.

In consequence, the SAR data acquired between 23:34:31 UTC on 15 January and 02:49:31 UTC on 16 January is unrecoverably lost.