As part of the mega plan, around 20 bridges, a number of tunnels, airbases, and several key roads are being developed in strategically key areas in Arunachal Pradesh to bolster the overall military preparedness, officials said on Monday. Major General Zubin A Minwalla, General-Officer-Commanding of the 5 Mountain Division, said the focus has been to further strengthen road infrastructure as well as the use of high-tech surveillance equipment to create more battlefield transparency.