We'll have plenty of news and reaction from Bahrain coming to the website in the next few hours, so do keep an eye out. Thank you very much for joining us once again, and be sure to check in again tomorrow as we do it all over again. Until then, cheerio.
Before we bid farewell to you for the day, we would be remiss not to point out that the latest season of Drive To Survive will be available to view for Netflix subscribers tomorrow. Here is our full review of the latest offering from Box To Box Films, while Ben Edwards has spoken to producer Tom Rogers about the human focus he believes makes it a standout for sister title GP Racing. Plus subscribers can read that here.
What next then for the teams? Dinner perhaps, but there will be plenty o debriefing going on as they pour over the data from the day and feed back to base. The work of an F1 team doesn't stop when the flag comes out.
The day was of course disrupted earlier on by the drain problem, but starting the second session early made up for the time lost by the drivers who were only out in the morning. That factor explains why Hulkenberg and Alonso managed only 31 laps, rather than any serious technical issue of the kind that befell Williams on Wednesday.
Sainz then takes the glory for Ferrari with a 1m29.921s for Ferrari on the C4, beating Perez to the top spot with the Mexican clocking a 1m30.679s on the C3. Perez did complete the most laps of anybody, 129, with Hamilton in third next closest by that metric on 123 tours.
With one minute on the clock, that will be it then for day two of testing. Sainz top for Ferrari will be the headlines, but he was on a softer compound when he set his time than Perez in second.
All the cars are back in the pits now, and it seems this time that most are garage-bound. It doesn't look like we'll get any more laps in, let alone improvements.
The track all of a sudden looks rather busy with several cars congregated together after Hamilton led a dramatic-looking safety car restart simulation. That will have made the photographers happy at least.
Among the support races next week for the Grand Prix are usual staples Formula 2, Formula 3 and the Porsche Carrera Cup Middle East. But wouldn't it be fun to see Supercars join the fray too? This shot was taken in 2007, the second of three visits to the Gulf for the Desert 400, and wasn't on a GP weekend - hence the different circuit layout.
Hamilton's last lap was just two tenths slower than his personal best today. Norris meanwhile is circulating around six seconds slower than what he managed earlier on.
Compared to the McLaren he's following, Hamilton's Mercedes is producing a heck of a lot more sparks down the main pit straight. It certainly looks dramatic, but is riding lower also faster? We shall see.
Sainz has been sitting pretty at the top of the charts for a while now, but his position may soon come under threat if that last effort from Perez is anything to go by. Using the C3 (remember, Sainz's best was on the C4), the Red Bull driver moves back into second ahead of Hamilton, just seven tenths shy of Sainz on a 1m30.684s.
It's not a glory run as such but Ocon does improve to a 1m32.061, again with the C3. It shaves around a tenth off his previous best, but isn't enough to move him up a spot.
Will anyone else elect to follow Ricciardo's lead and try a soft-shod glory run in the final 40 minutes of the day? It's perhaps a little early to be thinking about qualifying simulations yet.
It has been confirmed that Sky F1 commentator David Croft will miss his first races this year since joining the broadcaster in 2012, when he steps back from three grands prix. He will be replaced by BBC Radio 5 Live commentator Harry Benjamin, who led Sky’s coverage on F1 Juniors last year, for the Emilia-Romagna, Austrian and Azerbaijan Grands Prix.
Meanwhile, slow-motion replays show Sainz's Ferrari porpoising down the straight and giving the driver a rough old time. Thankfully the phenomenon is rarer than it used to be, but it's unlikely to be fully eradicated under this rule set.