SDI Divemaster requirement. I believe PADI has it too. No?
SDI:
1. Snorkeling skills – Minimum equipment: mask, fins, snorkel and additional equipment as required
a. 800 metre swim with mask, snorkel, and fins non-stop without the use of arms in less than 17
minutes
b. 400 metre swim on the surface, non-stop, any stroke, without the use of swimming aids, in less
than 10 minutes; swim goggles permitted
2. Scuba skills - minimum equipment: all equipment required for a SDI Dive Leader
a. In water, transport another diver in full scuba equipment at a quick pace for 4 minutes
b. Demonstrate a complete rescue scenario satisfactorily
c. Perform underwater skills with and without a mask
d. Swim on the surface, in full scuba equipment, using the snorkel, 100 metres
PADI:
Have candidates complete five waterskills exercises, earning a combined exercise score of at least 15. Candidates must
score at least a 3 in the equipment exchange; there is no passing score for any other single exercise.
Exercise 1: 400-Metre/Yard Swim
Swim 400 metres/yards nonstop, without swimming aids and using any stroke or combination of strokes.
Exercise 2: 15-minute Tread
Tread water, drown-proof, bob or float using no aids and wearing only a swimsuit for 15 minutes, with hands (not
arms) out of the water during the last two minutes.
Exercise 3: 800-Metre/Yard Swim
Swim 800 metres/yards face down, using mask, snorkel and fins, nonstop, without flotation aids and without using arms to swim.
Exercise 4: 100-Metre/Yard Inert Diver Tow
Tow (or push) a diver for 100 metres/yards nonstop, at the surface, without assistance – both divers equipped in full scuba equipment.
Exercise 5 — Equipment Exchange
In confined water, demonstrate the ability to effectively respond to an unusual circumstance underwater by exchanging all scuba equipment (except exposure suits and weights) with a buddy while sharing a single regulator second stage earning a minimum score of 3.
You get 1-5 points on each of the exercises, depending on how well you do them. "3" for the 400yd swim is less than 8 minutes, "3" for the 800yd snorkel run is less than 15 minutes."3" for the 100yd diver tow is less than 3 minutes. Most folks get 5 points on the tread, and 3-4 points on the tow, and 2-4 points on the swim and the snorkel run.
For both SDI and PADI there are more things, too, but this was to give a comparison.