Question: I want to ask that people who are not buried after death like if they died at sea or burnt but not buried, how they are answerable to munkar nakir and how they would go through their phases of grave?

Answer: 
Qabar is name where body parts are found. It does not only mean a dig. So immidiately same procedure is applied.
Hi there is no grave punishment.. only soul punishment..thanks
Times stops when you die..after death everthing happens in another dimension..Allah will put you straight away in to heaven or hell not in grave