Manor team boss Dave Ryan says the squad's display at the British Grand Prix was "sobering" as both Pascal Wehrlein and Rio Haryanto spun off in tricky conditions.
Manor scored its first point since its rebranding in Austria as Wehrlein placed 10th but at Silverstone the youngster spun off at Abbey and beached his MRT05 in the gravel.
Wehrlein was joined on the sidelines by team-mate Haryanto, who also erred at the corner later in the race, and was unable to continue.
"A rather sobering day after the high of our points-finish last weekend," Ryan commented.
"The pre-race downpour was pretty intense and even though the track was drying quite quickly there were quite a few smaller and heavier patches of standing water.
"Unfortunately these caught our drivers out – Pascal on the switch from full wets to intermediates and Rio when he switched to slicks.
"These are tricky conditions to manage at the same time as trying to maximise the race and keep pace with the cars ahead."