I got rid of the rest of the p!sh because,...well,... it's p!sh!
The last bit is also,...well,....P!SH!
With improvements in technology the oil is not harder to extract. The oil companies are finding more economic ways to extract the oil that previously was uneconomical to do so,.Oil prices are such that they can afford to invest in the developement of those deep sea methods.
Now. Away back to school ya dafty!