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From The PSUPedia

This article pertains to a mission which was available only during the limited-time event The Great Arms Race.

Seabed Echoes 水底に響く鋼音
Start lobby	Clyez City: 5th Floor
Start counter	GUARDIANS HQ
End lobby	Clyez City: 5th Floor
Version	Ambition of the Illuminus
Field	VR: Seabed Plant
Mission type	Event mission
Party size	1-4 players
Enemy elements

Our firm would like to obtain battle data against machinery. Our mission is a simulation of robots out of control in a seabed planet.
GRM

Mission requirements and rewards

Enemy information

Enemy name	Enemy buffs	Ele.	Mission LV C		Mission LV B		Mission LV A		Mission LV S		Mission LV S2		Mission LV S3
			LV	EXP	LV	EXP	LV	EXP	LV	EXP	LV	EXP	LV	EXP
Block 1
Grinna Bete C			10	206	35	636	85	1797	120	2154	150	2928	175	3573
GSM-05 Seeker			10	72	35	222	85	627	120	751	150	1021	175	1246
GSM-05B Bomalta			10	72	35	222	85	627	120	751	150	1021	175	1246
Block 2
Grinna Bete C			10	206	35	636	85	1797	120	2154	150	2928	175	3573
GSM-05 Seeker			10	72	35	222	85	627	120	751	150	1021	175	1246
GSM-05B Bomalta			10	72	35	222	85	627	120	751	150	1021	175	1246
YG-01K BUGGE			10	62	35	192	85	543	120	651	150	885	175	1080
Main Computer Room
Mother Brain			15	2584	40	6384	90	17024	125	20178	155	27018	180	32718

Item drops

Enemy name	Special drops	Mission LV C	Mission LV B	Mission LV A	Mission LV S	Mission LV S2	Mission LV S3
Block 1
Grinna Bete C	--	[B] Twin Brand	[B] Dual Pallasch	[B] Heavy Twins	[B] 2-headed Ragnus	[B] Deathrain	Deathrain
GSM-05 Seeker	Inverter Circuit Acids	Assault	Repeater	Drumline	[B] Muzzlefever	[B] Needle Cannon	Needle Cannon
GSM-05B Bomalta	Inverter Circuit Acids	[B] Assault	[B] Repeater	[B] Drumline	Phantom	Apocalypsic	[B] Apocalypsic
Normal box	Halva Blastad Escudo Din De Bow Perori Mate Shield Gum BT Fragment Kubara Wood	Par Wood	?	?	Par Ash, Ebon	Par Ebon, Walna	Par Ebon, Walna
Area drops	Photon Drop Indra Thunderstone	1-7★ ores [B] Swordoc	2-9★ ores Copernia [B] Swordoc	6-12★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hanzoc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc [B] Kan Yuc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc [B] Kan Yuc
Block 2
Grinna Bete C	--	[B] Twin Brand	[B] Dual Pallasch	[B] Heavy Twins	[B] 2-headed Ragnus	[B] Deathrain	Deathrain
GSM-05 Seeker	Inverter Circuit Acids	Assault	Repeater	Drumline	[B] Muzzlefever	[B] Needle Cannon	Needle Cannon
GSM-05B Bomalta	Inverter Circuit Acids	[B] Assault	[B] Repeater	[B] Drumline	Phantom	Apocalypsic	[B] Apocalypsic
YG-01K BUGGE	[B] Recov. items	[B] Staff	[B] Scepter	[B] Crozier	[B] Ageha-kikami	[B] Delpic	Delpic
Area drops	Photon Drop Indra Thunderstone	1-7★ ores [B] Swordoc	2-9★ ores Copernia [B] Swordoc	6-12★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hanzoc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc [B] Kan Yuc	7-15★ ores Copernia, Armania, Goldania, Morbinia, Titania [B] Hugecuttuc [B] Kan Yuc
Main Computer Room
Mother Brain	Halva Blastad White Meteora Escudo Din De Bow Stun / Resist BT Fragment Note Seed Nel Soul	Twin Autogun Rapit Midiline Harn-, Soldonium Nanosilica, -carbon Par Wood, Ash [B] Twin Brand [B] Rogapit	Dual Railgun Harn-, Soldonium Nanocarbon Par Ash	Galdike Harn-, Soldonium Nanocarbon, -resin Par Ash, Ebon [B] Buccaneer	Azul Fire Deathmaker Ganna Line Steln-, Catilium Nanocarbon, -resin, -polymer Par Ash, Ebon, Walna [B] Grand Cross [B] Blackheart [B] Twin Tornado [B] Frauduke [B] Castest Line	Crimson Nova Azul Fire Deathmaker Ranpegi Ganna Line Lumirus / Hit Charge Steln-, Catilium Nanocarbon, -resin, -polymer Morbinia Titania Lithnia Par Ash, Ebon, Walna, Ork [B] Grand Cross [B] Blackheart [B] Twin Tornado [B] Frauduke [B] Coni [B] Armas Line	Crimson Nova Azul Fire Deathmaker Germinus Gun Ranpegi Ganna Line Yiel Line Lumirus / Hit Charge Steln-, Catilium Iritista Spellstone Nanocarbon, -resin, -polymer, -ceran Morbinia Titania Lithnia Par Ash, Ebon, Walna, Ork [B] Grand Cross [B] Blackheart [B] Twin Tornado [B] Frauduke [B] Coni [B] Armas Line [B] Yiel Line