Riders to the sea, Coliseum, London

It was always going to be an intense evening, but factor in the untimely death of the man who was to have conducted, Richard Hickox, and it became a profoundly sad one.

How typical that Hickox should have been the motivator for English National Opera's first staging of Vaughan Williams's exquisitely understated setting of JM Synge's Riders to the Sea in the 50th anniversary year of the composer's death. But how inspirational of its director Fiona Shaw to set it up with a piece in so many ways its kindred spirit: Sibelius's Luonnotar. Both are elemental hymns to the natural world and our subservience to it; both sing of creation, mortality and rebirth.

A startling image of what might at first be construed as the tall shadow of a hooded form looking out to sea quickly emerges as an overhead perspective on an Ophelia-like figure suspended in the husk of a fishing boat, her long robes flowing into the water as oceanic projections (by multi-media artist Dorothy Cross) gradually overwhelm her. Sung with aching beauty by Susan Gritton, it's as if Sibelius's keening melismas had bled into the music of Maurya, the tragic mother of Riders to the Sea.

And as the ghosts of her lost sons ceremoniously take Sibelius's spirit of the air from the water, now impregnated with their souls, it is as if we really have found ourselves on the edge of the world, the edge of eternity. Designer Tom Pye's craggy Aran coastline is at one with the sea, a rectangle of light marking out a tracing of Maurya's home. She and her daughters (Kate Valentine and Claire Booth, both heartbreaking) and her one remaining son Bartley (Leigh Melrose) are thus so connected with the elements that their vulnerability and proximity to death is a constant throughout the fragile 40 minutes of Shaw's poetic staging.

The physicality of its anguish sometimes contradicts Vaughan Williams's modal calmness, but how wonderfully he frees the words so that, in Patricia Bardon's towering performance as Maurya, the sung and the almost spoken are indivisible. One really feels this woman's heroic resistance, the sheer effort of staying strong and upright – so that when she does finally take her last son's lifeless naked body in her arms, the moment is overwhelming. It's Vaughan Williams's finest moment, a lamentation of extraordinary beauty which Bardon sings as if finally released from her grief and somehow reborn. Fishing boats descend from above like coffins for each of her dead men; Luonnotar reappears, pregnant with the next? Quietly devastating.