There’s a short mention of the incident in “Airfield Focus” No.53
Hethel.
“The B-50 landed without without landing aids or runway lights in darkness and pouring rain, It finished up to the tops of its undercarriage in mud with little damage and the crew unhurt. For a few days afterwards a C-47 Dakota flew in daily with a working party, preparing the the B-50 for when it later made a successful take off.”
A copy of probably the same photograph appears, with the aircraft nose high in the aforementioned mud. The letter in the triangle on the tail is indistinct.