* Can you modulate the strength of the Bohr effect to extract more hemoglobin from oxygen (thus prolonging apnea time before desaturation)? Humpback whales (and very small animals) have a much stronger Bohr effect, presumably from hemoglobin mutations. One approach would be non-immunogenic artificial hemoglobin proteins (made with CRISPR and perhaps packaged into empty RBCs?), another option would be some drug that modulates the Bohr effect on human Hgb.