Mud rescues may take place in tidal areas. Incident commanders should have access to tide timetables to assist decision making.

There may be occasions when unstable surfaces are affected by some form of geological movement. The reasons for this movement may not be known and might not be noticeable, but the history of the initial cause of the structure's instability or collapse may indicate a need to be aware of potential ground movement. For example, in areas of known mining, the cause may be assigned to the collapse of old workings and therefore the possibility of further movement will need to be considered. Tactical and specialist advisers may be able to provide advice and monitoring equipment.