A320 pilot reported loss of hydraulic pressure and diversion to nearby suitable airport.

Narrative

Climbing through approximately 25;000 ft.; we received a HYD B LO LVL CAUTION; followed by HYD B LO PR just two minutes later. As we performed the appropriate ECAMs and checklists; ZZZ Center was trying to hand us off to ZZZ OCEANIC. At this point; we could see that we'd lost all hydraulic fluid from the BLUE system. In the interest of safety we decided not continue northbound into oceanic airspace. Instead; we decided to turn towards ZZZ. Once we were established southeast bound; we were able to report the problem to Dispatch via SATCOM; but the signal was weak and the call continually dropped. Also ACARS was inoperative due to the ATSU having been deferred.Once communication was reestablished with Dispatch and Maintenance Control; they recommended that we continue to ZZZ1 on the original flight plan. We felt that this was no longer an option as our Estimated Fuel On Board would've been 5;200 lbs at our ETA.While we were holding north of ZZZ we agreed with Dispatch to change our destination to ZZZ2 as the aircraft was then in a safe condition and the aircraft weight would be less than upon arrival in ZZZ2.We continued to ZZZ2; and the remainder of the flight was uneventful.