"automatic" mode after, to allow normal operation (and avoid detection). Switching elevators, getting too near the ceiling (or under the elevator) or the counterweight (or cables), or otherwise failing to follow safety precautions can lead to death or injury. Crackdowns may increase in both frequency and harshness, both legally and with respect to physical access to coveted locations. Some shafts (such as those intended for but lacking an elevator) are accessible by use of rope but are not actually climbable by themselves. Dangers Legal dangers Universities generally prohibit roof and tunnel hacking, either by explicit policies or blanket rules against entry into non-public utility spaces. The reasoning behind these policies generally stems from concern for university infrastructure and concern for students. Consequences vary from university to university; those caught may be warned, fined, officially reprimanded, suspended, or expelled. Depending on the circumstances, tunnelers and roofers may be charged with trespassing, breaking and entering, or other criminal charges. MIT, once a vanguard of roof and tunnel hacking (books have been published on hacks and hacking at MIT), has been cracking down on the activity. In October 2006, three students were caught hacking near a crawl space in the MIT Faculty Club, arrested by the MIT police, and later charged with trespassing, breaking and entering with the intent to commit a felony. The charges raised an outcry among students and alumni who believed that MIT ought to have continued its history of handling hacking-related incidents internally. Charges against those students were eventually dropped. In June 2008, another graduate student was arrested and faced charges of breaking and entering with intent to commit a felony and possession of burglarious instruments after being caught after-hours in a caged room in a research building's basement. Risks to building infrastructure Utility tunnels carry everything from drinking water to power to fiber-optic network cabling. Some roofs have high power radio broadcast or radio reception equipment and weather-surveillance equipment, damage to which can be costly. Roofs and tunnels also may contain switches, valves, and controls for utility systems that were not designed to be accessible to the general public. Due to security concerns there has been a trend towards installing intrusion alarms to protect particularly hazardous or high-value equipment. Personal hazards Roofs are dangerous; aside from the obvious risk of toppling over the edge (especially at night, in inclement weather, or after drinking) students could be injured by