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Malaysian Airlines allows an additional 10kg check-in baggage over the customary 20Kg for bona fide divers.
Was this told to you by the check-in counter staff or by a Malaysia Airlines staff and when was this because economy class passengers, starting from 14th February 2013, now enjoy 30kg baggage allowance with business at 40kg and first class at 50kg?
Also, according to their baggage / excess baggage pricing, scuba equipment is subjected to excess baggage charges and not to be considered as part of the allowance although there's just about no way they'll know since the security scaners are manned by police officers and not airline staff.