The virus that relies on molecules called reverse transcriptase to build DNA from its RNA molecules is RetroVirus.
Explanation:
Retrovirus is a type of virus that is made up of RNA. When it attacks a cell, RNA is inserted into the host cell. Retrovirus has a special enzyme called reverse transcriptase that is used to create DNA by using RNA as template. It inserts its RNA into host genome and changes the genetic information.
It is very dark down there, it is so deep that it makes it hard for scientists to be able to survive down there, & there is not really any ready to use equipment since we don't know how it is down there.