Vertical Datum: LAT Quality of Depth: SWS The MASTIFF was requisitioned for Naval service. She was mined in 1939. 20-NOV-1939 Sank 093 degs, 1 mile from Tongue Ltv. 24-SEP-1946 Swept, clear at 40, foul at 41.5Ft. Small contact. Gave slight a/s trace, position 51 30 15N 001 27 36E or 077.75 Deg, 3.54M from Tongue Sand Twr. 10-JUL-1950 Now clear at 50ft. 15-MAR-1962 Drift swept - clear at 47, foul at 49ft, least echo sounder depth 55 in general depth 59ft. Scour depth 67ft. 25-JAN-1967 Least echosounder depth 53, in general depth 58ft. Scour 62ft. 22-NOV-1983 In 51 30 17N 001 27 38E, least echosounder depth 15.6 in general depth 17.5-18m. Scour 18.5m deep. Side scan sonar height 1.9m. Lying approx 280/100 degs. Small detached pieces of wreckage nearby. 08-SEP-1989 In 51 30 17N 001 27 38E. Swept clear at 15.8, foul at 15.9m, least echosounder depth 15.8 in general depth 17.5m. Scour depth 18.1m, side scan sonar height 1.6m. Broken up, lying 110/290 deg, approx. Gives magnetometer deflection.

<1> Hydrographic Office wreck index, Extracted 20-JAN-1993, Page Nos. N/a (Bibliographic reference). SKE6339.