Add coriander leaves, mint leaves, green chilies and water in a blender.
Blend till a smooth paste is formed.
Turn on the instant pot and select sauté.
Add oil and crab legs and sauté for 3 minutes.
Add the blended paste, turmeric powder, salt and garam masala.
Close the lid of the instant pot.
Set instant pot to Manual at high pressure and cook for 5 minutes. Release the pressure naturally through steam vent.
Dish out and serve.