Doesn’t sound much, but ExxonMobil have set a record for undersea drilling:

ExxonMobil has completed the world’s. longest extended-reach well drilled from an existing offshore fixed platform drilling rig, increasing the company’s ability to produce more domestic oil supplies from existing facilities at the Santa Ynez unit, offshore southern California. The well drilled from the Heritage platform using ExxonMobil’s Fast Drill technology extends more than six miles horizontally and more than 7,000 feet below sea level.

Through the use of this extended reach drill technology, the well will be able to produce an additional 5.8 million barrels of oil equivalent, an amount equal to the annual energy consumption of over 144,000 Californians.