Inside the nest- Resin bees

 When I find resin bees inside nesting tunnels, I remove any mason bee cocoons , remove mason bee debris out of tunnels with a tooth brush, close up the nest and set out side ready for next year.

Two delicately placed resin walls.  No bees were in these cells.

Resin bee pupae within compartments made of resin.

Last year's resin bees emerged during summer months
when resin softened up with the heat.