Work has started to clear rubble at the collapsed Didcot power station where the bodies of three workers still remain missing.
But the site's owners, energy giant RWE, warned it would be a "long process" to remove the debris.
A spokesman said workers would be "carefully working their way in", two weeks after pleas from families to find their relatives.
Demolition workers Ken Cresswell, 57, and John Shaw, 61, both from Rotherham, South Yorkshire, and Chris Huxtable, from Swansea, remain missing following the collapse on 23 February.
A funeral has already been held for victim Mick Collings, 53, who lived in Brotton, Cleveland.