By 0615, with all power gone, the badly listing "Sentinel" contacted , and the "Green" beach-master by portable radio using dry cells from hand lanterns. This message brought "SC-530", "LCI-33", and "PC-550" to her assistance at the utmost speed. After the more seriously wounded had been evacuated on "LCI-33" and "SC-530", it became apparent that the ship would not remain afloat. Her list was about 28° and water was on her main deck when the remainder of her crew boarded "PC-550", at no small risk to the submarine chaser which then remained by "Sentinel" until she capsized at 1030 and went under at 1045.