Bengaluru, Sept 13 (PTI) : Hopes to salvage the lander-rover, part of India's Chandrayaan-2 mission, are fading with the window of opportunity to restore link with 'Vikram' closing in in about a week's time.  Lander Vikram, with rover Pragyan housed inside it, lost communication with ground-station early on September seven during its final descent, just 2.1 kms above the lunar surface, minutes before the planned touch-down on the Moon.     Efforts to reestablish the link has been going on since then. On September 8, ISRO said the lander was spotted on the lunar surface by camera on-board of the Chandrayaan-2 orbiter.     Vikram had a hard-landing. The lander, designed to execute a soft-landing on the lunar surface, and rover have a mission life of one Lunar day, which is equivalent to 14 earth days -- that means ISRO now has just over a week to spring Vikram back to life.     "Progressively, you can imagine that it becomes that much more difficult, with each passing hour, the available power on the battery gets drained out, and there won't be anything left for it to power and operate", said an ISRO official.  "With every passing minute, the situation becomes worse only... less and less probable (to establish contact with Vikram", he said.     "It looks more and more remote only", the official said when asked if there was a slender chance of re-establishing the link.