17-14 Change A U.S. Navy Diving Manual—Volume 4 determine  the  number  of  boats  required  based  on  the  diving  area,  medical evacuation plan, night operations, and the number of personnel participating in the dive operation.   Buddy  Lines.  Buddy  lines  are  considered  important  safety  equipment  for closed-circuit UBA dives. In special diving situations, such as certain combat swimmer operations or tended diving, the use of buddy lines may not be feasi- ble. The Diving Supervisor shall conduct dives without buddy lines only in situations where their use is not feasible or where their use will pose a greater hazard to the divers than by diving without them. Table 17-5.  MK 16 UBA Diving Equipment Requirements. General Diving Supervisor Divers Standby Diver 1.    Motorized safety boat (Note 1) 1.    Dive watch 1.    Dive watch (Note 2) 1.    Dive watch 2.    Radio (communications with parent unit, chamber, communication between safety boats when feasible) 2.    Dive Bill list 2. Face mask 2. Face mask 3.    High-intensity, wide-beam light (night operations) 3.    U.S. Navy Standard Air Decompression Tables 3.    Fins 3.    Fins 4.    Dive flags and/or special operations lights as required 4.    Closed-Circuit Mixed-Gas UBA Decompression Ta- bles using 0.7 ATA Con- stant Partial Pressure Ox- ygen in Nitrogen and in Helium. 4.    Dive knife 4.    Dive knife 5.    Sufficient (2 quarts) fresh water in case of chemical injury 5.    Recall device 5.    Approved life preserver 5.    Approved life preserver 6.    Appropriate thermal protection 6. Appropriate thermal protection 7.    Depth gauge (Note 2) 7. UBA with same depth capability 8.    Buddy line (as appropriate for EOD/SPECWAR operations) (Note 1) 8. Depth gauge 9. Tending line (as appropriate for EOD operations) (Note 3) 9.    Weight belt (if needed) 10.  Tending line Notes: 1.    See paragraph 17-4.2 2.    See paragraph 17-4.2.6 3.    See paragraph 17-4.4.4