New York Metropolitan Transportation Authority (MTA) officials unveiled  some of the technologies the agency is considering as part of its efforts to protect the system from future storms. The MTA has also been researching and investigating existing flood mitigation and resiliency systems used worldwide for possible adaption in New York.

The MTA is designing solutions to fully prevent water incursion at the approximately 600 entry points in Lower Manhattan as well as vulnerable vent plants and openings in other flood-prone areas. MTA New York City Transit (NYCT) is also analyzing all underground tube locations to ensure that critical points where water can enter the system are protected, according to officials.

Gov. Andrew M. Cuomo and MTA Chairman/CEO Thomas F. Prendergast, accompanied by U.S. Department of Housing and Urban Development Secretary Shaun Donovan and other officials, toured Lower Manhattan to see firsthand some of the emerging technologies being implemented to harden the system.

Gov. Cuomo and officials viewed a prototype entrance cover at the Whitehall St. subway station, developed by RSA Protective Technologies, to protect at least 13 vulnerable stairwells in Lower Manhattan. This stairway cover will be able to be rapidly installed without the need of mechanized equipment.

Officials also toured the new South Ferry subway station, closed since Superstorm Sandy filled the entire station with more than 14 million gallons of corrosive salt water, to view a tunnel plug under development by ILC Dover to protect subway portals where grade-level tracks transition to underground subways.

A “Tensioned Curtain,” is also under development to help mitigate flooding. If successfully prototyped and tested, the MTA hopes the technology could be applied to portals and stairwell locations throughout the system.

Another vendor, FloodBreak, is producing a permanently implantable device beneath sidewalk ventilation gratings that can be immediately and easily closed, sealing the vent from flood waters. If testing of an installed prototype is successful, several hundred units may be used in gratings at the most vulnerable locations in the city.

Across the MTA, more than 70 projects are in design worth approximately $4.5 billion. Five projects totaling $75 million are in procurement and 16 projects, worth $575 million, are already in construction.

At NYCT, design has begun for repairs to six subway tubes including work on signals, pump rooms, power and communications, tunnel lighting and ducts. More than one million riders use these six tubes on the average weekday. In addition to design of signal and other systems, NYCT is building two new pump trains that will reduce the time needed to pump water out of the subway system.

RELATED: "N.Y. MTA Works to Fix Impacts of Storms Past and Future."