This was an emergency situation and the tunnel had to be closed for the safety of all, and while a diversion was in place I know this would have added to journey time and caused disruption.
Roedd hon yn sefyllfa argyfwng ac roedd yn rhaid cau'r twnnel er diogelwch pawb, ac er bod dargyfeiriad yn ei le rwy'n gwybod y byddai hyn wedi ychwanegu at amser teithio gan amharu ar fywydau pobl.