Worth noticing in this breathhold is the slow onset of both a drop in O2 and pulse (most freedivers get an earlier pulse drop). The rising of blood pressure is also relativly low.
Preparation breathholds;
2.08 FRC, 4.45, 4.53, 6.43 - 2 hours rest.
Second max stat (7.04) started with 1 min FRC breathhold and then 3.20 min breathhold and then 7.04 breathhold.
Usually 3 min rest inbeetwen breathholds.
8 min rest before both max stat and 12 packs (0.7 litre) packing on max stats.