Yes, it really is that hard. Water valves that someone can walk up to and spin by hand is very much different from a valve that is a mile away (vertically) und

Yes, it really is that hard. Water valves that someone can walk up to and spin by hand is very much different from a valve that is a mile away (vertically) under water. Wikipedia says the pressure increases by 1 atmosphere every 33 feet (10m)... 5000 feet would be more than 150 times atmospheric pressure. Marine Remote Operated Vehicles (MROVs) http://en.wikipedia.org/wiki/MROV http://en.wikipedia.org/wiki/MROV are being used, but it is very difficult to operate them even in good conditions (flat seas and minimal currents). Add to that, the dexterity of the tools on the ROV is nowhere close to the dexterity of a human hand.