A fluid flow connector comprising: a first connector body (200, 600) defining: a first inner bore; and a first plurality of outer bores (204, 304); a second connector body defining: a second inner bore; and a second plurality of outer bores (204, 304), wherein, in an operational configuration in which the first connector body (200, 600) is attached to the second connector body, the first inner bore is configured to mate with the second inner bore to form a first fluid channel, and the first plurality of outer bores (204, 304) are each configured to mate with a respective one of the second plurality of outer bores (204, 304) to form a second fluid channel; and a sealing mechanism comprising a first sealing element and a second sealing element, wherein the sealing mechanism is configured to, in the operational configuration, seal the first fluid channel from the second fluid channel and seal the second fluid channel from an external environment of the fluid flow connector, wherein the first connector body (200, 600) further defines: a first groove configured to receive the first sealing element therein, wherein the first groove is positioned circumferentially around the first inner bore; and a second groove configured to receive the second sealing element therein, wherein the second groove is positioned circumferentially around the first plurality of outer bores (204, 304), characterized in that the first sealing element and/or the second sealing element comprise a malleable, cryogenic sealing material comprising indium. a first connector body (200, 600) defining: a first inner bore; and a first plurality of outer bores (204, 304); a first inner bore; and a first plurality of outer bores (204, 304); a second connector body defining: a second inner bore; and a second plurality of outer bores (204, 304), wherein, in an operational configuration in which the first connector body (200, 600) is attached to the second connector body, the first inner bore is configured to mate with the second inner bore to form a first fluid channel, and the first plurality of outer bores (204, 304) are each configured to mate with a respective one of the second plurality of outer bores (204, 304) to form a second fluid channel; and a second inner bore; and a second plurality of outer bores (204, 304), wherein, in an operational configuration in which the first connector body (200, 600) is attached to the second connector body, the first inner bore is configured to mate with the second inner bore to form a first fluid channel, and the first plurality of outer bores (204, 304) are each configured to mate with a respective one of the second plurality of outer bores (204, 304) to form a second fluid channel; and a sealing mechanism comprising a first sealing element and a second sealing element, wherein the sealing mechanism is configured to, in the operational configuration, seal the first fluid channel from the second fluid channel and seal the second fluid channel from an external environment of the fluid flow connector, wherein the first connector body (200, 600) further defines: a first groove configured to receive the first sealing element therein, wherein the first groove is positioned circumferentially around the first inner bore; and a second groove configured to receive the second sealing element therein, wherein the second groove is positioned circumferentially around the first plurality of outer bores (204, 304), characterized in that the first sealing element and/or the second sealing element comprise a malleable, cryogenic sealing material comprising indium. a first groove configured to receive the first sealing element therein, wherein the first groove is positioned circumferentially around the first inner bore; and a second groove configured to receive the second sealing element therein, wherein the second groove is positioned circumferentially around the first plurality of outer bores (204, 304), characterized in that the first sealing element and/or the second sealing element comprise a malleable, cryogenic sealing material comprising indium.