A subsea interface module configured to be coupled to a BOP assembly , the subsea interface module comprising: a first inlet configured to be coupled to and in fluid communication with a first auxiliary line and to permit fluid communication between the first auxiliary line and at least one of a booster line, a choke line, a kill line, and a bleed line associated with the BOP assembly ; a first outlet configured to be coupled to and in fluid communication with one of the booster line, the choke line, the kill line, and the bleed line; a second outlet configured to be coupled to and in fluid communication with one other of the booster line, the choke line, the kill line, and the bleed line; and one or more valves configured to control fluid communication between the first inlet and the first and second outlets, the one or more valves being movable between: a first state in which fluid communication is permitted between the first inlet and the first outlet; and a second state in which fluid communication is permitted between the first inlet and the second outlet; and a releasable riser connector configured to be coupled to a riser and to permit fluid communication between the riser and a throughbore of the BOP assembly ; wherein the module is configured such that, when the first auxiliary line is coupled to the first inlet and the riser is coupled to the riser connector : decoupling of the first auxiliary line from the first inlet does not decouple the riser from the riser connector ; and/or decoupling of the riser from the riser connector does not decouple the first auxiliary line from the first inlet . a first inlet configured to be coupled to and in fluid communication with a first auxiliary line and to permit fluid communication between the first auxiliary line and at least one of a booster line, a choke line, a kill line, and a bleed line associated with the BOP assembly ; a first outlet configured to be coupled to and in fluid communication with one of the booster line, the choke line, the kill line, and the bleed line; a second outlet configured to be coupled to and in fluid communication with one other of the booster line, the choke line, the kill line, and the bleed line; and one or more valves configured to control fluid communication between the first inlet and the first and second outlets, the one or more valves being movable between: a first state in which fluid communication is permitted between the first inlet and the first outlet; and a second state in which fluid communication is permitted between the first inlet and the second outlet; and a first state in which fluid communication is permitted between the first inlet and the first outlet; and a second state in which fluid communication is permitted between the first inlet and the second outlet; and a releasable riser connector configured to be coupled to a riser and to permit fluid communication between the riser and a throughbore of the BOP assembly ; wherein the module is configured such that, when the first auxiliary line is coupled to the first inlet and the riser is coupled to the riser connector : decoupling of the first auxiliary line from the first inlet does not decouple the riser from the riser connector ; and/or decoupling of the riser from the riser connector does not decouple the first auxiliary line from the first inlet . decoupling of the first auxiliary line from the first inlet does not decouple the riser from the riser connector ; and/or decoupling of the riser from the riser connector does not decouple the first auxiliary line from the first inlet . <EOS>