the project at Poas is finished and the boat survived Some impressions:
This is the 300 m wide lake. The water temperature was 55 C and pH was 0.5. There were a lot of phreatic explosions in the middle of the lake. The yellow rafters are sulfur.
Gasmasks were necessary because of the very high SO2 concentration. It was also very hot.
And here is the final product: