The Rhum development is a 44-km long subsea tieback to the BP-operated Bruce field, and is expected to access recoverable reserves of 23 bcum of gas, which will be exported onwards from Bruce via the Frigg pipeline system to St Fergus; associated condensate will be piped via Bruce into the Forties pipeline system. With the combination of a high-pressure, high-temperature (HPHT) gas reservoir developed using a long-distance subsea tie-back, Rhum is a world first. The field is in 109m of water, and was discovered in 1977. The tie-back line to the Bruce platform is a 22-in diameter high-integrity, pressure-protection system (HIPPS) protected pipe-in-pipe main pipeline; the field's down-hole temperature is around 150C, and pressures reach 87bar (12,700psi). For comparison purposes, the Bruce gasfield records temperatures of 99C and pressures of 41bar (6,000psi).