In case of bridge greater than 10.7m in height and which cannot be inspected from beneath due to watery situation the instrument suited for inspection work is?

Barins snooper vehicle is used to inspect in case of bridge greater than 10.7m in height and which cannot be inspected from beneath due to watery situation. The snooper is mounted on a heavy duty truck with a swiveling platform and the underside of the bridge deck can be inspected by using the hydraulically operated platform.