Nov. 28, 1940 the HMS Triton N-15 sailed from Malta for a patrol in the southern Adriatic Sea. Triton had been the first British warship to sink a vessel during World War 2, sadly the vessel was another British submarine. The Triton torpedoed and sank the HMS Oxley P-55 on Sept. 10, 1939 off the coast of Norway. Oxley became the first British submarine lost in the days old war. What happened to the Triton after she left Malta is still a mystery, her wreck has not been found to this day. It is thought that she became a victim of a mine. (It should be noted that this is always the first explanation for a lost boat.)

Two years to the day later on Nov. 28, 1942 the HMS Traveller N-48 sailed from the same base at Malta and met the same fate, unknown. Traveller was to patrol in Taranto Bay and to do a recon patrol of the harbor in advance of a planned attack on the Italian fleet by Chariot's. The attack however would never happen and the
Traveller would not return home. Her loss is generally attributed to Italian motor torpedo boats but the results of these attacks are unconfirmed.

It is interesting to note the other submarines lost on this date.
1941: U-95 sunk in the Mediterranean by HNLMS O-21 (Dutch submarine).
1942: Dessie, the Italian sub was sunk by an RAF Hudson also in the Mediterranean,
1943: U-542 sunk off Portugal by an RAF Wellington.
1944: U-80 the only known non-combat loss, sank in the Baltic Sea due to a diving accident.

The U-95 had 12 survivors and the Dessie may have had some survivors but nobody got off any of the other boats.