"Salvage of the submarine would only be attempted thereafter for which many alternatives including deploying professional salvers are also being considered.
"However, presently, gaining access to the submarine and locating bodies is the top priority," the navy said.
The heat of the explosion had melted parts of the internal hull deforming the submarine hatches, preventing access to different compartments.
Heavy duty pumps were used to pump out the seawater from the submarine.
The families of the 18 personnel were being provided regular updates.
The navy feels that some of the armaments inside the deep sea fighter vessel, stored on the rear side may be recovered undamaged as the flames did not completely gut that portion of the submarine.