The Guardian UK is reporting that a core melt has breached the Unit 2 reactor pressure vessel at Fukushima Daiichi Unit 2 in a lava-like formation that has flowed into the drywell which is the component of the reactor containment structure. The drywell is reportedly now filled with seawater, however, the overall containment structure very likely was ruptured by a hydrogen gas explosion on March 14. While all three reactor Units 1, 2 and 3 are reported to have extremely high levels of radioactive water outside containment in the turbine halls, Unit 2 is  leaking high level radioactive water into groundwater offsite now discovered in a trench that opens on the shore of the Pacific Ocean. TEPCo workers and Japanese Defense Forces have been sandbagging around the trench openning to stave off flushing the reactor's radioactive contents into the ocean.