I was under the impression in Canada a SWET chair is used to practice HEUBA deployment underwater at a 'safe', shallow depth but in the UK the oil industry training body has removed all EBS HUET runs from their CA-EBS standard harving the total HUET runs too. Considering the AAIB have already queried the training for the earlier rebreathers in an interim Sumburgh report one can only hope they opine on EBS training in their final report.