Saturday the 3rd of May saw Unbeaten enter Marsamxett Harbour for the first time. She proceeded up Lazaretto Creek 8 days after she had sailed from Gibraltar. The U-class submarines were commonly berthed next to the old Lazaretto, on the south side of Manoel Island, located in the centre of Marsamxett Harbour. The U-Class submarine HMS/M Usk was also supposed to reach Malta on the same day. When Usk did not arrive on the 3rd she was ordered to report her position. Nothing was heard. Again on the 5th Usk was called, and told to report, but still nothing. By this time she was probably sunk.