Sure, I can assist you with that.

To build a bushcraft underground dugout shelter with a clay fireplace and develop your survival skills, follow these steps:

Choose the location: Select a suitable location for your shelter. Look for a spot with good drainage and away from potential hazards such as falling trees or flooding.

Dig the shelter: Use shovels and other digging tools to dig a hole in the ground. The hole should be deep enough to accommodate your body comfortably and have enough headroom. Shape the walls and ceiling of the shelter using the tools.

Line the shelter: Line the shelter with branches, leaves, or other natural materials to insulate it from the ground and keep it dry.

Create the entrance: Create an entrance for the shelter by digging a trench from the surface to the shelter. Make sure the entrance is concealed from view to avoid detection.

Build the fireplace: Use clay, rocks, or other materials to build a fireplace inside the shelter. The fireplace will provide warmth and can be used for cooking food.

Install ventilation: Install ventilation in the shelter to ensure adequate airflow. Use a pipe or a makeshift chimney to vent smoke from the fireplace.

Create furniture: Use branches, rocks, and other materials to create furniture such as a bed, shelves, and seating.

Stock up on supplies: Stock up on food, water, and other supplies to last you through your stay in the shelter. Ensure that you have enough supplies to sustain you until you can resupply.

With patience and attention to detail, you can build a bushcraft underground dugout shelter with a clay fireplace and develop your survival skills. It requires some physical effort and outdoor skills, but the end result can be a fulfilling and rewarding experience.