left side. on the right side, you see these from earlier. the government's point man on the disaster says the testing involves closing off vents and measuring the pressure in the well. take a listen to this. >> and this exercise, high pressure is good. we have a considerable amount of pressure down in the reservoir, forcing the hydrocarbons up through the wellbore. we are looking for somewhere between 8 and 9,000 psi inside the capping stack which would indicate to us that the hydrocarbons are being forced up and the wellbore's being able to withstand that pressure. and that is good news. >> 8,000 to 9,000 psi. just to give you context, coming out of your faucet is about 100. so that say large amount of pressure they have to watch in order to find that success benchmark. the testing process that he's talking about could take anywhere from six to two days. it all depends on bp.